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Wednesday, February 14, 2024

Indigenous peoples

From Wikipedia, the free encyclopedia
https://en.wikipedia.org/wiki/Indigenous_peoples
A Kaqchikel family in the hamlet of Patzutzun, Guatemala, 1993

There is no generally accepted definition of Indigenous peoples, although in the 21st century the focus has been on self-identification, cultural difference from other groups in a state, a special relationship with their traditional territory, and an experience of subjugation and discrimination under a dominant cultural model.

Estimates of the population of Indigenous peoples range from 250 million to 600 million. There are some 5,000 distinct Indigenous peoples spread across every inhabited climate zone and continent of the world except Antarctica. Most Indigenous peoples are in a minority in the state or traditional territory they inhabit and have experienced domination by other groups, especially non-Indigenous peoples.Although many Indigenous peoples have experienced colonization by settlers from European nations, Indigenous identity is not determined by Western colonization.

The rights of Indigenous peoples are outlined in national legislation, treaties and international law. The 1989 International Labour Organization (ILO) Convention on Indigenous and Tribal Peoples protects Indigenous peoples from discrimination and specifies their rights to development, customary laws, lands, territories and resources, employment, education and health. In 2007, the United Nations (UN) adopted a Declaration on the Rights of Indigenous Peoples including their rights to self-determination and to protect their cultures, identities, languages, ceremonies, and access to employment, health, education and natural resources.

Indigenous peoples continue to face threats to their sovereignty, economic well-being, languages, cultural heritage, and access to the resources on which their cultures depend. In the 21st century, Indigenous groups and advocates for Indigenous peoples have highlighted numerous apparent violations of the rights of Indigenous peoples.  

Etymology

Indigenous is derived from the Latin word indigena, meaning "sprung from the land, native". The Latin indigena is based on the Old Latin indu "in, within" + gignere "to beget, produce". Indu is an extended form of the Proto-Indo-European en or "in".

Definitions

Colorized photograph of an Amis couple in traditional clothing. Taken in pre-World War II Japanese-ruled Taiwan.

There is no generally accepted definition of Indigenous peoples in the United Nations or international law. Various national and international organizations, non-government organizations, governments, Indigenous groups and scholars have developed definitions or have declined to provide a definition.

Historical

As a reference to a group of people, the term "indigenous" was first used by Europeans to differentiate the Indigenous peoples of the Americas from enslaved Africans. The first known use was by Sir Thomas Browne in 1646, who wrote "and although in many parts thereof there be at present swarms of Negroes serving under the Spaniard, yet were they all transported from Africa, since the discovery of Columbus; and are not indigenous or proper natives of America."

In the 1970s, the term was used as a way of linking the experiences, issues, and struggles of groups of colonized people across international borders. At this time 'indigenous people(s)' also began to be used to describe a legal category in Indigenous law created in international and national legislation. The use of the plural 'peoples' recognizes the cultural differences between various Indigenous peoples.

The first meeting of the United Nations Working Group on Indigenous Populations (WGIP) was on 9 August 1982 and this date is now celebrated as the International Day of the World's Indigenous Peoples.

Recent

In the 21st century, the concept of Indigenous peoples is understood in a wider context than only the colonial experience. The focus has been on self-identification as indigenous peoples, cultural difference from other groups in a state, a special relationship with their traditional territory, and an experience of subjugation and discrimination under a dominant cultural model.

United Nations

No definition of Indigenous peoples has been adopted by a United Nations agency. The Secretariat of the Permanent Forum on Indigenous Issues states, "in the case of the concept of 'indigenous peoples', the prevailing view today is that no formal universal definition of the term is necessary, given that a single definition will inevitably be either over- or under-inclusive, making sense in some societies but not in others."

However, a number of UN agencies have provided statements of coverage for particular international agreements concerning Indigenous peoples or "working definitions" for particular reports.

The International Labour Organization's (ILO) Indigenous and Tribal Peoples Convention, 1989 (ILO Convention No. 169), states that the convention covers:

peoples in independent countries who are regarded as indigenous on account of their descent from the populations which inhabited the country, or a geographical region to which the country belongs, at the time of conquest or colonisation or the establishment of present state boundaries and who, irrespective of their legal status, retain some or all of their own social, economic, cultural and political institutions.

The convention also covers "tribal peoples" who are distinguished from Indigenous peoples and described as "tribal peoples in independent countries whose social, cultural and economic conditions distinguish them from other sections of the national community and whose status is regulated wholly or partially by their own customs or traditions or by special laws or regulations."

The convention states that self-identification as indigenous or tribal is a fundamental criterion for determining the groups to which the convention applies. The UN Declaration on the Rights of Indigenous Peoples does not define Indigenous peoples but affirms their right to self-determination including determining their own identity.

Inter-American Commission on Human Rights

The Inter-American Commission on Human Rights does not provide a definition of Indigenous peoples stating that, "such a definition is not necessary for purposes of protecting their human rights." In determining coverage of Indigenous peoples, the commission uses the criteria developed in documents such as ILO Convention No. 169 and the United Nations Declaration on the Rights of Indigenous Peoples. The commission states that self-identification as indigenous is a fundamental criterion.

World Bank

The World Bank states, "Indigenous Peoples are distinct social and cultural groups that share collective ancestral ties to the lands and natural resources where they live, occupy or from which they have been displaced."

Amnesty International

Amnesty International does not provide a definition of Indigenous peoples but states that they can be identified according to certain characteristics:

  • Self identification as Indigenous peoples
  • A historical link with those who inhabited a country or region at the time when people of different cultures or ethnic origins arrived
  • A strong link to territories and surrounding natural resources
  • Distinct social, economic or political systems
  • A distinct language, culture and beliefs
  • Marginalized and discriminated against by the state
  • They maintain and develop their ancestral environments and systems as distinct peoples

Scholars

Academics and other scholars have developed various definitions of Indigenous peoples. In 1986-87, José Martínez Cobo, developed the following "working definition" :

Indigenous communities, peoples, and nations are those that, having a historical continuity with pre-invasion and pre-colonial societies that developed on their territories, consider themselves distinct from other sectors of the societies now prevailing in those territories, or parts of them. They form at present non-dominant sectors of society and are determined to preserve, develop, and transmit to future generations their ancestral territories, and their ethnic identity, as the basis of their continued existence as peoples, in accordance with their own cultural patterns, social institutions and legal systems.

Martínez Cobo states that the following factors are relevant to historical continuity: occupation of ancestral lands, or at least of part of them; common ancestry with the original occupants of these lands; cultural factors such as religion, tribalism, dress, etc.; language; residence in certain parts of the country, or in certain regions of the world; and other relevant factors.

Guatemalan girls in their traditional clothing from the town of Santa Catarina Palopó on Lake Atitlán

In 2004, James Anaya, defined Indigenous peoples as "living descendants of pre-invasion inhabitants of lands now dominated by others. They are culturally distinct groups that find themselves engulfed by other settler societies born of forces of empire and conquest".

In 2012, Tuck and Yang propose a criterion based on accounts of origin: "Indigenous peoples are those who have creation stories, not colonization stories, about how we/they came to be in a particular place - indeed how we/they came to be a place. Our/their relationships to land comprise our/their epistemologies, ontologies, and cosmologies".

Other views

It is sometimes argued that all Africans are Indigenous to Africa, all Asians are Indigenous to parts of Asia, or that there can be no Indigenous peoples in countries which did not experience large-scale Western settler colonialism. Many countries have avoided the term Indigenous peoples or have denied that Indigenous peoples exist in their territory, and have classified minorities who identify as Indigenous in other ways, such as 'hill tribes' in Thailand, 'scheduled tribes' in India, 'national minorities' in China, 'cultural minorities' in the Philippines, 'isolated and alien peoples' in Indonesia, and various other terms.

History

Classical antiquity

Greek sources of the Classical period acknowledge Indigenous people whom they referred to as "Pelasgians". Ancient writers saw these people either as the ancestors of the Greeks, or as an earlier group of people who inhabited Greece before the Greeks. The disposition and precise identity of this former group is elusive, and sources such as Homer, Hesiod and Herodotus give varying, partially mythological accounts. Dionysius of Halicarnassus in his book, Roman Antiquities, gives a synoptic interpretation of the Pelasgians based on the sources available to him then, concluding that Pelasgians were Greek. Greco-Roman society flourished between 330 BCE and 640 CE and undertook successive campaigns of conquest that subsumed more than half of the known world of the time. But because preexisting populations within other parts of Europe at the time of classical antiquity had more in common – culturally speaking – with the Greco-Roman world, the intricacies involved in expansion across the European frontier were not so contentious relative to Indigenous issues.

Africa

In European late antiquity, many Berbers, Copts and Nubians of north Africa converted to various forms of Christianity under Roman rule, although elements of traditional religious beliefs were retained. Following the Arab invasions of North Africa in the 7th century, many Berbers were enslaved or recruited into the army. The majority of Berbers, however, remained nomadic pastoralists who also engaged in trade as far as sub-Saharan Africa. Coptic Egyptians remained in possession of their lands and many preserved their language and Christian religion. By the 10th century, however, the majority of the population of north Africa spoke Arabic and practiced Islam.

Alonso Fernández de Lugo presenting the captured Guanche kings of Tenerife to Ferdinand and Isabella

From 1402, the Guanche of the Canary Islands resisted Spanish attempts at colonization. The islands finally came under Spanish control in 1496. Mohamed Adhikari has called the conquest of the islands a genocide.

Early 15th-century Portuguese exploration of the west coast of Africa was motivated by a quest for gold and crusading against Islam. Portugal's first attempt at colonization in what is now Senegal ended in failure. In the 1470s, the Portuguese established a fortified trading post on the West coast of Africa, south of the Akan goldfields. The Portuguese engaged in extensive trade of goods for gold and, in later years, slaves for their sugar plantations in the islands off West Africa and in the New World. In 1488, Portuguese ships rounded the Cape of Good Hope and by the 17th century, Portugal had established seaborn trading routes and fortified coastal trading posts from West Africa to India and Southern China, and a settler colony in Brazil.

In 1532, the first African slaves were transported directly to the Americas. The trade in slaves expanded sharply in the 17th century, with the involvement of the French, Dutch and English, before declining in the 19th century. At least 12 million slaves were transported from Africa. The slave trade increased inter-tribal warfare and stunted population growth and economic development in the west African interior.

Americas

Indigenous encounters with Europeans increased during the age of discovery. The Europeans were motivated by a range of factors including trade, the exploitation of natural resources, spreading Christianity, and establishing strategic military bases, colonies and settlements.

From 1492, the Arawak peoples of the Caribbean islands encountered Spanish colonizers initially led by Christopher Columbus. The Spanish enslaved some of the native population and forced others to work on farms and gold mines in a system of labor called ecomienda. Spanish settlements spread from Hispaniola to Puerto Rico, the Bahamas and Cuba, leading to a severe decline in the Indigenous populations from disease, malnutrition, settler violence and cultural disruption.

In the 1520s, the peoples of Mesoamerica encountered the Spanish who entered their lands in search of gold and other resources. Some indigenous peoples chose to ally with the Spanish to end Aztec rule. The Spanish incursions led to the conquest of the Aztec Empire and its fall. The Cempoalans, Tlaxcalans and other allies of the Spanish were given some autonomy, but the Spanish were de facto rulers of Mexico. Smallpox devastated the indigenous population and aided the Spanish conquest.

Map with the main travels of the Age of Discovery (which began in the 15th century)

In 1530, the Spanish sailed south from Panama to the lands of the Inca Empire in the west of South America. The Inca, weakened by a smallpox epidemic and civil war, were defeated by the Spanish at Cajamarca in 1532, and the emperor Atahualpa was captured and executed. The Spanish appointed a puppet emperor and captured the Inca capital of Cuzco with the support of a number of native peoples. The Spanish established a new capital in 1535 and defeated an Inca rebellion in 1537, thus consolidating the conquest of Peru.

In the 1560s, the Spanish established colonies in Florida and in 1598 founded a colony in New Mexico. However, the heartland of the Spanish colonies remained New Spain (including Mexico and most of Central America) and Peru (including most of South America).

In the 17th century, French, English and Dutch trading posts multiplied in northern America to exploit whaling, fishing and fur trading. French settlements progressed up the St Lawrence river to the Great Lakes and down the Mississippi to Louisiana. English and Dutch settlements multiplied down the Atlantic coast from modern Massachusetts to Georgia. Native peoples formed alliances with the Europeans in order to promote trade, preserve their autonomy, and gain allies in conflicts with other native peoples. However, horses and new weapons made inter-tribal conflicts more deadly and the native population was devastated by introduced diseases. Native peoples also experienced losses from violent conflict with the colonists and the progressive dispossession of their traditional lands.

Depiction of a Spaniard entering Chalco with three Tlaxcalan soldiers and an Indigenous porter in the Lienzo de Tlaxcala (pre-1585)

In 1492, the population of the Americas as a whole was about 50 to 100 million. By 1700, introduced diseases had reduced the native population by 90%. European migration and transfer of slaves from Africa reduced the native population to a minority. By 1800 the population of North America comprised about 5 million Europeans and their descendants, one million Africans and 600,000 indigenous Americans.

Native populations also encountered new animals and plants introduced by Europeans. These included pigs, horses, mules, sheep and cattle; wheat, barley, rye, oats, grasses and grapevines. These exotic animals and plants radically transformed the local environment and disrupted traditional agriculture and hunting practices.

Oceania

The indigenous populations of the Pacific had increasing contact with Europeans in the 18th century as British, French and Spanish expeditions explored the region. The natives of Tahiti had encounters with the expeditions of Wallis (1766), Bougainville (1768), Cook (1769) and many others before being formally colonized by the French in 1880. The indigenous inhabitants of the Hawaiian Islands first encountered Europeans in 1778 when Cook explored the region. Following increasing contact with European missionaries, traders and scientific expeditions, the indigenous population fell before their lands were annexed by the United States in 1893.

The Māori of New Zealand also had sporadic encounters with Europeans in the 17th and 18th centuries. Following encounters with Cook's exploration parties in 1769-70, New Zealand was visited by numerous European and North American whaling, sealing, and trading ships. From the early 19th century, Christian missionaries began to settle New Zealand, eventually converting most of the Māori population. The Māori population declined to around 40% of its pre-contact level during the 19th century; introduced diseases were the major factor. New Zealand became a British Crown colony in 1841.

The Aboriginal inhabitants of Australia, after brief encounters with European explorers in the 17th and 18th centuries, had extensive contact with Europeans when the continent was progressively colonized by the British from 1788. During colonization, the Aboriginal people experienced depopulation from disease and settler violence, dispossession of their land, and severe disruption of their traditional cultures. By 1850, indigenous peoples were a minority in Australia.

European justifications for colonization

From the 15th to the 19th centuries, European powers used a number of rationales for the colonization of newly-encountered lands populated by indigenous peoples. These included a duty to spread the Gospel to non-Christians, to bring civilization to barbarian peoples, a natural law right to explore and trade freely with other peoples, and a right to settle and cultivate uninhabited or uncultivated land which they considered terra nullius ("no one's land").

Robert J. Miller, Jacinta Ruru, Larissa Behrendt and Tracey Lindberg argue that European powers rationalized their colonization of the New World by the discovery doctrine, which they trace back to papal decrees authorizing Spain and Portugal to conquer newly discovered non-Christian lands and convert their populations to Christianity. Kent McNeil, however, states, "While Spain and Portugal favoured discovery and papal grants because it was generally in their interests to do so, France and Britain relied more on symbolic acts, colonial charters, and occupation." Benton and Strauman argue that European powers often adopted multiple, sometimes contradictory, legal rationales for their acquisition of territory as a deliberate strategy in defending their claims against European rivals.

Settler independence and continuing colonialism

Although the establishment of colonies throughout the world by various European powers aimed to expand those powers' wealth and influence, settler populations in some localities became anxious to assert their own autonomy. For example, settler independence movements in thirteen of the British American colonies were successful by 1783, following the American Revolutionary War. This resulted in the establishment of the United States of America as an entity separate from the British Empire. The United States continued and expanded European colonial doctrine through adopting a version of the discovery doctrine as law in 1823 with the US Supreme Court case Johnson v. McIntosh. Statements at the Johnson court case illuminated the United States' support for the principles of the discovery doctrine:

The United States ... [and] its civilized inhabitants now hold this country. They hold, and assert in themselves, the title by which it was acquired. They maintain, as all others have maintained, that discovery gave an exclusive right to extinguish the Indian title of occupancy, either by purchase or by conquest; and gave also a right to such a degree of sovereignty, as the circumstances of the people would allow them to exercise. ... [This loss of native property and sovereignty rights was justified, the Court said, by] the character and religion of its inhabitants ... the superior genius of Europe ... [and] ample compensation to the [Indians] by bestowing on them civilization and Christianity, in exchange for unlimited independence.

Population and distribution

A map of uncontacted peoples, around the start of the 21st century

Estimates of the population of Indigenous peoples range from 250 million to 600 million. The United Nations estimates that there are over 370 million Indigenous people living in over 90 countries worldwide. This would equate to just fewer than 6% of the total world population. This includes at least 5,000 distinct peoples.

As there is no universally accepted definition of Indigenous Peoples, their classification as such varies between countries and organizations. In the Americas, Australia and New Zealand, Indigenous status is often applied unproblematically to groups descended from the peoples who lived there prior to European settlement. However, In Asia and Africa, Indigenous status has sometimes been rejected by certain peoples, denied by governments or applied to peoples who may not be considered "Indigenous" in other contexts. The concept of indigenous peoples is rarely used in Europe, where very few indigenous groups are recognized, with the exception of groups such as the Sámi.

Indigenous societies range from those who have been significantly exposed to the colonizing or expansionary activities of other societies (such as the Maya peoples of Mexico and Central America) through to those who as yet remain in comparative isolation from any external influence (such as the Sentinelese and Jarawa of the Andaman Islands).

Contemporary distinct Indigenous groups survive in populations ranging from only a few dozen to hundreds of thousands and more. Many Indigenous populations have undergone a dramatic decline and even extinction, and remain threatened in many parts of the world. Some have also been assimilated by other populations or have undergone many other changes. In other cases, Indigenous populations are undergoing a recovery or expansion in numbers.

Certain Indigenous societies survive even though they may no longer inhabit their "traditional" lands, owing to migration, relocation, forced resettlement or having been supplanted by other cultural groups. In many other respects, the transformation of culture of Indigenous groups is ongoing, and includes permanent loss of language, loss of lands, encroachment on traditional territories, and disruption in traditional ways of life due to contamination and pollution of waters and lands.

Environmental and economic benefits of the Indigenous stewardship of land

A WRI report mentions that "tenure-secure" Indigenous lands generates billions and sometimes trillions of dollars' worth of benefits in the form of carbon sequestration, reduced pollution, clean water and more. It says that tenure-secure Indigenous lands have low deforestation rates, they help to reduce GHG emissions, control erosion and flooding by anchoring soil, and provide a suite of other local, regional and global ecosystem services. However, many of these communities find themselves on the front lines of the deforestation crisis, and their lives and livelihoods threatened.

Indigenous peoples and the environment

Misconceptions about the historical relationship between Indigenous populations and their landbase has informed some Westerners view of California's "wild Eden", which may influence policy decisions about the "wilderness". Some academics assumed that the only pre-Colonial human interactions with nature were as "hunter-gatherers". Others say that the relationship was one of "calculated tempered use of nature as active agents of environmental change and stewardship". They argue that a view of "wilderness" as uninhabited nature has resulted in removal of Indigenous inhabitants to preserve "the wild", and that depriving the land of traditional Indigenous practices such as controlled burns, harvesting, and seed scattering has yielded dense understory shrubbery or tickets of young trees which are inhospitable to life. Recent studies indicate that Indigenous peoples used land sustainably, without causing substantial losses of biodiversity, for thousands of years.

A goal is to ascertain an unbiased view of Indigenous practices of resource management. Historical literature, archaeological findings, ecological field studies, and Native Peoples' cultures show indications that Indigenous land management practices were largely successful in promoting habitat heterogeneity, increasing biodiversity, and maintaining certain vegetation types, sustaining human lives while conserving natural resources.

Recently, it has come to light that the deforestation rate of Indonesian rainforests has been far greater than estimated. Such a rate could not have been the product of globalization as understood before; rather, it seemed that ordinary local people dependent on these forests for their livelihoods are in fact "joining distant corporations in creating uninhabitable landscapes."

In eastern Penan, three categories of misrepresentation are noticeable: The Molong concept is purely a stewardship notion of resource management. Communities or individuals take ownership of specific trees, maintaining and harvesting from them sustainably over a long period of time. Some feel this practice has been romanticized in environmentalist writings. Landscape features and particularly their names in local languages provided geographical and historical information for Penan people; whereas in environmentalist accounts, it has turned into a spiritual practice where trees and rivers represent forest spirits that are sacred to the Penan people. A typical stereotype of some environmentalists' approach to ecological ethnography is to present Indigenous "knowledge" of nature as "valuable" to the outside world because of its hidden medicinal benefits. In reality, eastern Penan populations do not identify a medicinal stream of "knowledge". These misrepresentations in the "narrative" of Indigeneity and "value" of Indigenous knowledge might have been helpful for Penan's people in their struggle to protect their environment, but it might also have disastrous consequences. What happens if another case did not fit in this romantic narrative, or another Indigenous knowledge did not seem beneficial to the outside world. These people were being uprooted in the first place because their communities did not fit well with the state's system of values.

Indigenous peoples by region

Indigenous populations are distributed in regions throughout the globe. The numbers, condition and experience of Indigenous groups may vary widely within a given region. A comprehensive survey is further complicated by sometimes contentious membership and identification.

Africa

Sub-Saharan Africa

Starting fire by hand, San people in Botswana.
African Pygmies in Congo

In the postcolonial period, the concept of specific Indigenous peoples within the African continent has gained wider acceptance, although not without controversy. The highly diverse and numerous ethnic groups that comprise most modern, independent African states contain within them various peoples whose situation, cultures and pastoralist or hunter-gatherer lifestyles are generally marginalized and set apart from the dominant political and economic structures of the nation. Since the late 20th century these peoples have increasingly sought recognition of their rights as distinct Indigenous peoples, in both national and international contexts.

Though the vast majority of African peoples are "indigenous" in the sense that they originate from that continent, in practice, identity as an Indigenous people per the modern definition is more restrictive, and certainly not every African ethnic group claims identification under these terms. Groups and communities who do claim this recognition are those who, by a variety of historical and environmental circumstances, have been placed outside of the dominant state systems, and whose traditional practices and land claims often come into conflict with the objectives and policies implemented by governments, companies and surrounding dominant societies.

North Africa

The indigenous peoples of North Africa predominantly comprise the Berbers in the Maghreb and the Copts and Nubians in the Nile Valley. The vast majority of them have been Arabized after the Islamic conquests under the Rashidun and Umayyad caliphates.

Americas

Inuit on a traditional qamutik (dog sled) in Cape Dorset, Nunavut, Canada.
A girl wears the traditional Nahua headdress in Yohualichan, Veracruz.

Indigenous peoples of the Americas are broadly recognized as being those groups and their descendants who inhabited the region before the arrival of European colonizers and settlers (i.e., pre-Columbian). Indigenous peoples who maintain, or seek to maintain, traditional ways of life are found from the high Arctic north to the southern extremities of Tierra del Fuego.

The impacts of historical and ongoing European colonization of the Americas on Indigenous communities have been in general quite severe, with many authorities estimating ranges of significant population decline primarily due to disease, land theft and violence. Several peoples have become extinct, or very nearly so. But there are and have been many thriving and resilient Indigenous nations and communities.

North America

North America is sometimes referred to by Indigenous peoples as Abya Yala or Turtle Island.

In Mexico, about 11 million people, or 9% of Mexico's total population, self-reported as Indigenous in 2015, making it the country with the highest Indigenous population in North America. In the southern states of Oaxaca (65.73%) and Yucatán (65.40%), the majority of the population is Indigenous, as reported in 2015. Other states with high populations of Indigenous peoples include Campeche (44.54%), Quintana Roo, (44.44%), Hidalgo, (36.21%), Chiapas (36.15%), Puebla (35.28%), and Guerrero (33.92%).

Indigenous peoples in Canada comprise the First Nations, Inuit and Métis. The descriptors "Indian" and "Eskimo" have fallen into disuse in Canada. More currently, the term "Aboriginal" is being replaced with "Indigenous". Several national organizations in Canada changed their names from "Aboriginal" to "Indigenous". Most notable was the change of Aboriginal Affairs and Northern Development Canada (AANDC) to Indigenous and Northern Affairs Canada (INAC) in 2015, which then split into Indigenous Services Canada and Crown-Indigenous Relations and Northern Development Canada in 2017. According to the 2016 Census, there are around 1,670,000 Indigenous people in Canada. There are currently over 600 recognized First Nations governments or bands spread across Canada, such as the Cree, Mohawk, Mikmaq, Blackfoot, Coast Salish, Innu, Dene and more, with distinctive Indigenous cultures, languages, art, and music. First Nations peoples signed 11 numbered treaties across much of what is now known as Canada between 1871 and 1921, except in parts of British Columbia.

The Inuit have achieved a degree of administrative autonomy with the creation in 1999 of the territories of Nunavik (in Northern Quebec), Nunatsiavut (in Northern Labrador) and Nunavut, which was until 1999 a part of the Northwest Territories. The autonomous territory of Greenland within the Kingdom of Denmark is also home to a recognized Indigenous and majority population of Inuit (about 85%) who settled the area in the 13th century, displacing the Indigenous European Greenlandic Norse.

In the United States, the combined populations of Native Americans, Inuit and other Indigenous designations totaled 2,786,652 (constituting about 1.5% of 2003 U.S. census figures). Some 563 scheduled tribes are recognized at the federal level, and a number of others recognized at the state level.

Central and South America

Quechua woman and child in the Sacred Valley, Andes, Peru

In some countries (particularly in Latin America), Indigenous peoples form a sizable component of the overall national population – in Bolivia, they account for an estimated 56–70% of the total nation, and at least half of the population in Guatemala and the Andean and Amazonian nations of Peru. In English, Indigenous peoples are collectively referred to by different names that vary by region, age and ethnicity of speakers, with no one term being universally accepted. While still in use in-group, and in many names of organizations, "Indian" is less popular among younger people, who tend to prefer "Indigenous" or simply "Native, with most preferring to use the specific name of their tribe or Nation instead of generalities. In Spanish or Portuguese speaking countries, one finds the use of terms such as índios, pueblos indígenas, amerindios, povos nativos, povos indígenas, and, in Peru, Comunidades Nativas (Native Communities), particularly among Amazonian societies like the Urarina and Matsés. In Chile, there the most populous indigenous peoples are the Mapuche in the Center-South and the Aymaras in the North. Rapa Nui of Easter Island, who are a Polynesian people, are the only non-Amerindian indigenous people in Chile.

Indigenous peoples make up 0.4% of all Brazilian population, or about 700,000 people. Indigenous peoples are found in the entire territory of Brazil, although the majority of them live in Indian reservations in the North and Center-Western part of the country. On 18 January 2007, FUNAI reported that it had confirmed the presence of 67 different uncontacted peoples in Brazil, up from 40 in 2005. With this addition Brazil has now overtaken the island of New Guinea as the country having the largest number of uncontacted peoples.

Asia

Kalash girls in Pakistan

West Asia

There are competing claims that Palestinian Arabs and Jews are indigenous to historic Palestine/the Land of Israel. The argument entered the Israeli–Palestinian conflict in the 1990s, with Palestinians claiming Indigenous status as a pre-existing population displaced by Jewish settlement, and currently constituting a minority in the State of Israel. Israeli Jews have also claimed indigeneity, citing religious and historical connections to the land as their ancient homeland; some have disputed the authenticity of Palestinian claims. In 2007, the Negev Bedouin were officially recognized as Indigenous peoples of Israel by the United Nations. This has been criticized both by scholars associated with the Israeli state, who dispute the Bedouin's claim to indigeneity, and those who argue that recognizing just one group of Palestinians as indigenous risks undermining others' claims and "fetishizing" nomadic cultures.

South Asia

India's Andaman and Nicobar Islands in the Indian Ocean are also home to several Indigenous groups such as the Andamanese of Strait Island, the Jarawas of Middle Andaman and South Andaman Islands, the Onge of Little Andaman Island and the uncontacted Sentinelese of North Sentinel Island. They are registered and protected by the Indian government.

In Sri Lanka, the Indigenous Vedda people constitute a small minority of the population today.

Marina A. Temina, a native speaker and teacher of the Nivkh language

Northeast Asia

Ainu man performing a traditional Ainu dance

Ainu people are an ethnic group indigenous to Hokkaidō, the Kuril Islands, and much of Sakhalin. As Japanese settlement expanded, the Ainu were pushed northward and fought against the Japanese in Shakushain's Revolt and Menashi-Kunashir Rebellion, until by the Meiji period they were confined by the government to a reservation near Lake Akan in Hokkaidō. In a ground-breaking 1997 decision involving the Ainu people of Japan, the Japanese courts recognized their claim in law, stating that "If one minority group lived in an area prior to being ruled over by a majority group and preserved its distinct ethnic culture even after being ruled over by the majority group, while another came to live in an area ruled over by a majority after consenting to the majority rule, it must be recognized that it is only natural that the distinct ethnic culture of the former group requires greater consideration."

The Dzungar Oirats are indigenous to the Dzungaria in Northern Xinjiang.

The Sarikoli Pamiris are indigenous to Tashkurgan in Xinjiang.

The Tibetans are indigenous to Tibet.

The Ryukyuan people are indigenous to the Ryukyu Islands.

The languages of Taiwanese aborigines have significance in historical linguistics, since in all likelihood Taiwan was the place of origin of the entire Austronesian language family, which spread across Oceania.

In Hong Kong, the indigenous inhabitants of the New Territories are defined in the Sino-British Joint Declaration as people descended through the male line from a person who was in 1898, before Convention for the Extension of Hong Kong Territory. There are several different groups that make up the indigenous inhabitants, the Punti, Hakka, Hoklo, and Tanka. All are nonetheless considered part of the Cantonese majority, although some like the Tanka have been shown to have genetic and anthropological roots in the Baiyue people, the pre-Han Chinese inhabitants of Southern China.

The Russians invaded Siberia and conquered the indigenous people in the 17th–18th centuries.

Nivkh people are an ethnic group indigenous to Sakhalin, having a few speakers of the Nivkh language, but their fisher culture has been endangered due to the development of oil field of Sakhalin from 1990s.

In Russia, definition of "Indigenous peoples" is contested largely referring to a number of population (less than 50,000 people), and neglecting self-identification, origin from indigenous populations who inhabited the country or region upon invasion, colonization or establishment of state frontiers, distinctive social, economic and cultural institutions. Thus, indigenous peoples of Russia such as Sakha, Komi, Karelian and others are not considered as such due to the size of the population (more than 50,000 people), and consequently they "are not the subjects of the specific legal protections." The Russian government recognizes only 40 ethnic groups as indigenous peoples, even though there are 30 other groups to be counted as such. The reason of nonrecognition is the size of the population and relatively late advent to their current regions, thus indigenous peoples in Russia should be numbered less than 50,000 people.

Southeast Asia

Dayak people in Borneo

The Malay Singaporeans are the Indigenous people of Singapore, inhabiting it since the Austronesian migration. They had established the Kingdom of Singapura back in the 13th century. The name "Singapore" is an anglicisation of the Malay name Singapura which is derived from the Sanskrit word for 'lion city'. The native Malay name for the main island of Singapore is Pulau Ujong.

Dayak People are one of the Indigenous groups of Borneo. It is a loose term for over 200 riverine and hill-dwelling ethnic groups, located in Borneo, each with its own dialect, customs, laws, territory, and culture, although common distinguishing traits are readily identifiable.

The Cham are the Indigenous people of the former state of Champa which was conquered by Vietnam in the Cham–Vietnamese wars during Nam tiến. The Cham in Vietnam are only recognized as a minority, and not as an Indigenous people by the Vietnamese government despite being indigenous to the region.

The Degar (Montagnards) are indigenous to Central Highlands (Vietnam) and were conquered by the Vietnamese in the Nam tiến.

The Khmer Krom are the Indigenous people of the Mekong Delta and Saigon which were acquired by Vietnam from Cambodian King Chey Chettha II in exchange for a Vietnamese princess.

In Indonesia, there are 50 to 70 million people who are classified as Indigenous peoples by the local Indigenous rights advocacy group Aliansi Masyarakat Adat Nusantara. However, the Indonesian government does not recognize the existence of indigenous peoples, classifying every Native Indonesian ethnic group as "indigenous" despite the clear cultural distinctions of certain groups. This problem is shared by many other countries in the ASEAN region.

In the Philippines, there are 135 ethno-linguistic groups, 110 of which are considered as Indigenous peoples by the National Commission on Indigenous Peoples. The Indigenous people of Cordillera Administrative Region and Cagayan Valley in the Philippines are the Igorot people. The Indigenous peoples of Mindanao are the Lumad peoples and the Moro (Tausug, Maguindanao Maranao and others) who also live in the Sulu archipelago. There are also others sets of Indigenous peoples in Palawan, Mindoro, Visayas, and the rest central and south Luzon. The country has one of the largest Indigenous peoples population in the world. The recognition of the rights of Indigenous peoples was legally enshrined in 1997 with the Indigenous Peoples' Rights Act.

In Myanmar, indigenous peoples include the Shan, the Karen, the Rakhine, the Karenni, the Chin, the Kachin and the Mon. However, there are more ethnic groups that are considered indigenous, for example, the Akha, the Lisu, the Lahu or the Mru, among others.

Europe

Sámi family in Lapland, 1936

Various ethnic groups have lived in Europe for millennia. However, the concept of indigenous peoples is rarely used in the European context and the UN recognizes very few Indigenous populations within Europe; those which are recognized as such are confined to the far north and far east of the continent.

Indigenous minority populations in Europe include the Sámi peoples of northern Norway, Sweden, and Finland and northwestern Russia (in an area also referred to as Sápmi); the Nenets of northern Russia, and the Inuit of Greenland. Some sources describe the Sámi as the only recognized indigenous peoples in Europe, with others describing them as the only indigenous people in the European Union.

Other groups, particularly in Central, Western and Southern Europe, that might be considered to fit the description of indigenous peoples in the Indigenous and Tribal Peoples Convention, 1989, such as the Sorbs, are generally categorized as national minorities instead.

Oceania

Australia

Aboriginal Australian dancers

In Australia, the Indigenous populations are the Aboriginal Australian peoples (comprising many different nations and language groups) and the Torres Strait Islander peoples (also with sub-groups). These two groups are often referred to as Indigenous Australians, although terms such as First Nations and First Peoples are also used.

Pacific Islands

Polynesian, Melanesian and Micronesian peoples originally populated many of the present-day Pacific Island countries in the Oceania region over the course of thousands of years. European, American, Chilean and Japanese colonial expansion in the Pacific brought many of these areas under non-Indigenous administration, mainly during the 19th century. During the 20th century, several of these former colonies gained independence and nation-states formed under local control. However, various peoples have put forward claims for Indigenous recognition where their islands are still under external administration; examples include the Chamorros of Guam and the Northern Marianas, and the Marshallese of the Marshall Islands. Some islands remain under administration from Paris, Washington, London or Wellington.

Dani people from the central highlands of western New Guinea

The remains of at least 25 miniature humans, who lived between 1,000 and 3,000 years ago, were recently found on the islands of Palau in Micronesia.

In most parts of Oceania, Indigenous peoples outnumber the descendants of colonists. Exceptions include Australia, New Zealand and Hawaii. In New Zealand, based on various factors including census data and self-identification, the proportion of full or part Māori of the population on 30 June 2021 was estimated to be 17%. Māori developed from Polynesian people who settled in New Zealand after migrations from other Pacific islands, probably in the 13th century. Many leaders of Māori nations (iwi) signed a written agreement with the British Crown in 1840, known as the Treaty of Waitangi.

A majority of the Papua New Guinea population is Indigenous, with more than 700 different nationalities recognized in a total population of 8 million. The country's constitution and key statutes identify traditional or custom-based practices and land tenure, and explicitly set out to promote the viability of these traditional societies within the modern state. However, conflicts and disputes concerning land use and resource rights continue between indigenous groups, the government, and corporate entities.

Indigenous rights and other issues

endorses Declaration on the Rights of Indigenous People, 2010
The New Zealand delegation, including Māori members, endorses the United Nations Declaration on the Rights of Indigenous Peoples in 2010.

The 1989 ILO Convention on Indigenous and Tribal Peoples mainly concerns non-discrimination but also covers indigenous peoples’ rights to development, customary laws, lands, territories and resources, employment, education and health. By 2013, the convention had been ratified by 22 countries, mainly in Latin America.

In 2007, the United Nations (UN) adopted a Declaration on the Rights of Indigenous Peoples (UNDRIP) specifying the collective rights of Indigenous peoples, including their rights to self-determination and to protect their cultures, identities, languages, ceremonies, and access to employment, health, education and natural resources. The declaration is not a formally binding treaty but some provisions might be considered customary international law. The declaration has been endorsed by at least 148 states but its provisions have not been consistently implemented.

Indigenous peoples confront a diverse range of concerns associated with their status and interaction with other cultural groups, as well as changes in their inhabited environment. Some challenges are specific to particular groups; however, other challenges are commonly experienced. These issues include cultural and linguistic preservation, land rights, ownership and exploitation of natural resources, political determination and autonomy, environmental degradation and incursion, poverty, health, and discrimination.

The interactions between Indigenous and non-Indigenous societies throughout history and contemporarily have been complex, ranging from outright conflict and subjugation to some degree of mutual benefit and cultural transfer. A particular aspect of anthropological study involves investigation into the ramifications of what is termed first contact, the study of what occurs when two cultures first encounter one another. The situation can be further confused when there is a complicated or contested history of migration and population of a given region, which can give rise to disputes about primacy and ownership of the land and resources.

Wherever Indigenous cultural identity is asserted, common societal issues and concerns arise. These concerns are often not unique to Indigenous groups. Despite the diversity of Indigenous peoples, they share common problems and issues in dealing with the prevailing, or invading, society. They are generally concerned that the cultures and lands of Indigenous peoples are being lost and that Indigenous peoples suffer both discrimination and pressure to assimilate into the surrounding or colonizing societies. This is borne out by the fact that the lands and cultures of nearly all of the peoples listed at the end of this article are under threat. Notable exceptions are the Sakha and Komi peoples (two northern Indigenous peoples of Russia), who now control their own autonomous republics within the Russian state, and the Canadian Inuit, who form a majority of the territory of Nunavut (created in 1999). Despite the control of their territories, many Sakha people have lost their lands as a result of the Russian Homestead Act, which allows any Russian citizen to own any land in the Far Eastern region of Russia.

In Australia, a landmark case, Mabo v Queensland (No 2), saw the High Court of Australia reject the idea of terra nullius. This rejection ended up recognizing that there was a pre-existing system of law practiced by the Meriam people.

A 2009 United Nations publication says:

Although indigenous peoples are often portrayed as a hindrance to development, their cultures and traditional knowledge are also increasingly seen as assets. It is argued that it is important for the human species as a whole to preserve as wide a range of cultural diversity as possible, and that the protection of indigenous cultures is vital to this enterprise.

Human rights violations

Indigenous peoples march for their right to self-determination in Davao City (2008).

According to Samuel Totten, some governments do not respect the rights of Indigenous peoples. In the latter part of the twentieth century the genocide of Indigenous peoples in Australia and Namibia attracted more attention from the international community including scholars and human rights organizations.

The Bangladeshi Government has stated that there are "no indigenous peoples in Bangladesh". This statement has angered the Indigenous peoples of Chittagong Hill Tracts, Bangladesh, collectively known as the Jumma. Experts have protested against this move of the Bangladesh Government and have questioned the Government's definition of the term "indigenous peoples". This move by the Bangladesh Government is seen by the Indigenous peoples of Bangladesh as another step by the Government to further erode their already limited rights.

Hindu Chams and Muslim Chams have both experienced religious and ethnic persecution and restrictions on their faith under the current Vietnamese government, with the Vietnamese state confiscating Cham property and forbidding Cham from observing their religious beliefs. Hindu temples were turned into tourist sites against the wishes of the Cham Hindus. In 2010 and 2013 several incidents occurred in Thành Tín and Phươc Nhơn villages where Cham were murdered by Vietnamese. In 2012, Vietnamese police in Chau Giang village stormed into a Cham Mosque, stole the electric generator, and also raped Cham girls. Cham in the Mekong Delta have also been economically marginalized, with ethnic Vietnamese settling on land previously owned by Cham people with state support.

The Indonesian government has outright denied the existence of Indigenous peoples within the countries' borders. In 2012, Indonesia stated that 'The Government of Indonesia supports the promotion and protection of indigenous people worldwide ... Indonesia, however, does not recognize the application of the indigenous peoples concept ... in the country'. Along with the brutal treatment of the country's Papuan people (a conservative estimate places the violent deaths at 100,000 people in West New Guinea since Indonesian occupation in 1963, see Papua Conflict) has led to Survival International condemning Indonesia for treating its Indigenous peoples as the worst in the world.

The Vietnamese viewed and dealt with the Indigenous Montagnards from the Central Highlands of Vietnam as "savages", which caused a Montagnard uprising against the Vietnamese. The Vietnamese were originally centered around the Red River Delta but engaged in conquest and seized new lands such as Champa, the Mekong Delta (from Cambodia) and the Central Highlands during Nam Tien. While the Vietnamese received strong Chinese influence in their culture and civilization and were Sinicized, and the Cambodians and Laotians were Indianized, the Montagnards in the Central Highlands maintained their own Indigenous culture without adopting external culture and were the true Indigenous of the region. To hinder encroachment on the Central Highlands by Vietnamese nationalists, the term Pays Montagnard du Sud-Indochinois (PMSI) emerged for the Central Highlands along with the indigenous being addressed by the name Montagnard. The tremendous scale of Vietnamese Kinh colonists flooding into the Central Highlands has significantly altered the demographics of the region. The anti-ethnic minority discriminatory policies by the Vietnamese, environmental degradation, deprivation of lands from the Indigenous people, and settlement of Indigenous lands by an overwhelming number of Vietnamese settlers led to massive protests and demonstrations by the Central Highland's indigenous ethnic minorities against the Vietnamese in January–February 2001. This event gave a tremendous blow to the claim often published by the Vietnamese government that in Vietnam "There has been no ethnic confrontation, no religious war, no ethnic conflict. And no elimination of one culture by another."

Indigenous protesters from Vale do Javari, one of the largest indigenous territories in Brazil

In May 2016, the Fifteenth Session of the United Nations Permanent Forum on Indigenous Issues (UNPFII) affirmed that Indigenous peoples are distinctive groups protected in international or national legislation as having a set of specific rights based on their linguistic and historical ties to a particular territory, prior to later settlement, development or occupation of a region. The session affirms that, since Indigenous peoples are vulnerable to exploitation, marginalization, oppression, forced assimilation, and genocide by nation states formed from colonizing populations or by different, politically dominant ethnic groups, individuals and communities maintaining ways of life indigenous to their regions are entitled to special protection.

The Indigenous people from Tanzania's Maasai community were reportedly subjected to eviction from their ancestral land to make way for a luxury game reserve by Otterlo Business Corporation in June 2022. The game reserve was reportedly being set up for the royals of the United Arab Emirates also linked to OBC or the Otterlo Business Corporation. According to lawyers and human rights groups and activists, approximately 30 Maasai people were injured by security forces in the process of eviction and delimiting a land area of 1500 km2. A 2019 UN report has described OBC as a 'UAE-based' luxury-game hunting company, granted a license to hunt by the Tanzanian government in 1992 for "the UAE royal family to organize private hunting trips", denying the Maasai people access to their own land.

Health issues

In December 1993, the United Nations General Assembly proclaimed the International Decade of the World's Indigenous People, and requested UN specialized agencies to consider with governments and indigenous people how they can contribute to the success of the Decade of Indigenous People, commencing in December 1994. As a consequence, the World Health Organization, at its Forty-seventh World Health Assembly, established a core advisory group of Indigenous representatives with special knowledge of the health needs and resources of their communities, thus beginning a long-term commitment to the issue of the health of Indigenous peoples.

The World Health Organization noted in 2003 that "Statistical data on the health status of indigenous peoples is scarce. This is especially notable for indigenous peoples in Africa, Asia and eastern Europe", but snapshots from various countries (where such statistics are available) show that indigenous people are in worse health than the general population, in advanced and developing countries alike: higher incidence of diabetes in some regions of Australia; higher prevalence of poor sanitation and lack of safe water among Twa households in Rwanda; a greater prevalence of childbirths without prenatal care among ethnic minorities in Vietnam; suicide rates among Inuit youth in Canada are eleven times higher than the national average; infant mortality rates are higher for Indigenous peoples everywhere.

The first UN publication on the State of the World's Indigenous Peoples revealed alarming statistics about indigenous peoples' health. Health disparities between indigenous and non-indigenous populations are evident in both developed and developing countries. Native Americans in the United States are 600 times more likely to acquire tuberculosis and 62% more likely to commit suicide than the non-Indian population. Tuberculosis, obesity, and type 2 diabetes are major health concerns for the indigenous in developed countries. Globally, health disparities touch upon nearly every health issue, including HIV/AIDS, cancer, malaria, cardiovascular disease, malnutrition, parasitic infections, and respiratory diseases, affecting indigenous peoples at much higher rates. Many causes of Indigenous children's mortality could be prevented. Poorer health conditions amongst indigenous peoples result from longstanding societal issues, such as extreme poverty and racism, but also the intentional marginalization and dispossession of Indigenous peoples by dominant, non-Indigenous populations and societal structures.

Racism and discrimination

"Savages of Mokka and Their House in Formosa", pre-1945, Taiwan under Japanese rule

Indigenous peoples have frequently been subjected to various forms of racism and discrimination. Indigenous peoples have been denoted as being barbaric, primitive, savage or uncivilized. These terms were commonly used during the heyday of European colonial expansion, and they are still being used by certain societies in modern times.

During the 17th century, Europeans commonly labeled Indigenous peoples "uncivilized". Some philosophers, such as Thomas Hobbes (1588–1679), considered Indigenous people mere "savages". Others (especially literary figures in the 18th century) popularized the concept of "noble savages". Those who were close to the Hobbesian view tended to believe that they had a duty to "civilize" and "modernize" the Indigenous.

Survival International runs a campaign to stamp out media portrayals of Indigenous peoples as "primitives" or "savages".

After World War I (1914–1918), many Europeans came to doubt the morality of the means which were used to "civilize" peoples. At the same time, the anti-colonial movement, and advocates for the rights of Indigenous peoples, argued that words such as "civilized" and "savage" were products and tools of colonialism, and they also argued that colonialism itself was savagely destructive. In the mid-20th century, European attitudes began to shift to the view that Indigenous and tribal peoples are the only peoples who should have the right to decide what should happen to their ancient cultures and their ancestral lands.

Cultural appropriation

New Age and Neopagan adherents often look to the cultures of Indigenous peoples seeking to find ancient traditional truths and spiritual practices to appropriate into their lifestyles and worldviews.

Environmental injustice

Helena Gualinga, an indigenous environmental and human rights activist

At an international level, Indigenous peoples have received increased recognition of their environmental rights since 2002, but few countries respect these rights in reality. The UN Declaration on the Rights of Indigenous Peoples, adopted by the General Assembly in 2007, established Indigenous peoples' right to self-determination, stating rights to manage natural resources, and cultural and intellectual property. In countries where these rights are recognized, land titling and demarcation procedures are often put on delay, or leased out by the state as concessions for extractive industries without consulting Indigenous communities.

Many in the United States federal government are in favor of exploiting oil reserves in the Arctic National Wildlife Refuge, where the Gwich'in Indigenous people rely on herds of caribou. Oil drilling could destroy thousands of years of culture for the Gwich'in. On the other hand, some of the Inupiat people, from another Indigenous community in the region, favor oil drilling because they could benefit economically.

The introduction of industrial agricultural technologies such as fertilizers, pesticides, and large plantation schemes have destroyed ecosystems that Indigenous communities formerly depended on, forcing resettlement. Development projects such as dam construction, pipelines and resource extraction have displaced large numbers of Indigenous peoples, often without providing compensation. Governments have forced Indigenous peoples off of their ancestral lands in the name of ecotourism and national park development. Indigenous women are especially affected by land dispossession because they must walk longer distances for water and fuel wood. These women also become economically dependent on men when they lose their livelihoods. Indigenous groups asserting their rights has most often resulted in torture, imprisonment, or death.

The building of dams can hurt Indigenous peoples by hurting the ecosystems that provide them water, food. For example, the Munduruku people in the Amazon rainforest are opposing the building of Tapajós dam with the help of Greenpeace.

Most Indigenous populations are already subject to the deleterious effects of climate change. Climate change has not only environmental, but also human rights and socioeconomic implications for Indigenous communities. The World Bank acknowledges climate change as an obstacle to Millennium Development Goals, notably the fight against poverty, disease, and child mortality, in addition to environmental sustainability.

Use of indigenous knowledge

Native American dancer of the Save Our Ancestors Remains and Resources Indigenous Network Group (SOARRING) Foundation, a not-for-profit organization whose mission is to educate people about Indigenous ways of life

Indigenous knowledge is considered as very important for issues linked with sustainability. Professor Martin Nakata is a pioneer in the field of bringing indigenous knowledge to mainstream academics and media through digital documentation of unique contributions by aboriginal people.

Knowledge reconstruction

The Western and Eastern Penan people are two major groups of Indigenous populations in Malaysia. The Eastern Penan are famous for their resistance to loggers threatening their natural resources, specifically Sago palms and various fruit bearing trees. Because of the Penan's international fame, environmentalists often visited the area to document such happenings and learn more about and from the people there, including their perspective on the land's invasion. While Indigenous people comprise less than 5% of the population, they caretake for over 80% of global biodiversity. 

Environmentalists such as Davis and Henley, who Brosius writes lumped all native groups of Malaysia into one homogeneous group with the same ideas and traditions, and lacked dialectical connections needed to deeply understand the Penan, lacked full knowledge of the situation's specific weight to the Indigenous peoples. The two embarked on a mission, stating they wished to help with conservation of the Penan's land resources, but Brosious states they were among the many who repackaged traditional knowledge into something that fit a Western narrative and agenda, and that Davis and Henley romanticized and misconstrued the traditional Penan concept of molong (meaning: "to preserve" – the Penan marked trees for personal use and to preserve them for future harvesting of fruits or for materials).

Another common occurrence is to extend Indigenous knowledge beyond its limits and into unrelated meanings that western consumers find spiritually profound. This tendency of journalists extends beyond Davis and Henley. It serves non-Natives to add a narrative and value beyond that which already exists within the knowledge base of Indigenous peoples. Not only do these fictionalized accounts of some Indigenous knowledge and traditions skew the beliefs of onlookers, but they also contribute to cultural genocide as the actual spiritual and religious beliefs of the Indigenous people are disappeared and replaced with the westernized fiction.

Saccade

From Wikipedia, the free encyclopedia
Trace of saccades of the human eye on a face while scanning

A saccade (/səˈkɑːd/ sə-KAHD; French: [sakad]; French for 'jerk') is a quick, simultaneous movement of both eyes between two or more phases of fixation in the same direction. In contrast, in smooth-pursuit movements, the eyes move smoothly instead of in jumps. The phenomenon can be associated with a shift in frequency of an emitted signal or a movement of a body part or device. Controlled cortically by the frontal eye fields (FEF), or subcortically by the superior colliculus, saccades serve as a mechanism for fixation, rapid eye movement, and the fast phase of optokinetic nystagmus. The word appears to have been coined in the 1880s by French ophthalmologist Émile Javal, who used a mirror on one side of a page to observe eye movement in silent reading, and found that it involves a succession of discontinuous individual movements.

Function

Humans and many animals do not look at a scene in fixed steadiness; instead, the eyes move around, locating interesting parts of the scene and building up a mental, three-dimensional 'map' corresponding to the scene (as opposed to the graphical map of avians, that often relies upon detection of angular movement on the retina).

When scanning immediate surroundings or reading, human eyes make saccadic movements and stop several times, moving very quickly between each stop. The speed of movement during each saccade cannot be controlled; the eyes move as fast as they are able. One reason for the saccadic movement of the human eye is that the central part of the retina—known as the fovea—which provides the high-resolution portion of vision is very small in humans, only about 1–2 degrees of vision, but it plays a critical role in resolving objects. By moving the eye so that small parts of a scene can be sensed with greater resolution, body resources can be used more efficiently.

Timing and kinematics

Saccades are one of the fastest movements produced by the human eye (blinks may reach even higher peak velocities). The peak angular speed of the eye during a saccade reaches up to 700°/s in humans for great saccades (25° of visual angle); in some monkeys, peak speed can reach 1000°/s. Saccades to an unexpected stimulus normally take about 200 milliseconds (ms) to initiate, and then last from about 20–200 ms, depending on their amplitude (20–30 ms is typical in language reading). Under certain laboratory circumstances, the latency of, or reaction time to, saccade production can be cut nearly in half (express saccades). These saccades are generated by a neuronal mechanism that bypasses time-consuming circuits and activates the eye muscles more directly. Specific pre-target oscillatory (alpha rhythms) and transient activities occurring in posterior-lateral parietal cortex and occipital cortex also characterise express saccades.

Saccadic mainsequence, showing single saccades from a participant performing a visually-guided saccade task

The amplitude of a saccade is the angular distance the eye travels during the movement. For amplitudes up to 15 or 20°, the velocity of a saccade linearly depends on the amplitude (the so-called saccadic main sequence, a term borrowed from astrophysics; see Figure). For amplitudes larger than 20°, the peak velocity starts to plateau (nonlinearly) toward the maximum velocity attainable by the eye at around 60°. For instance, a 10° amplitude is associated with a velocity of 300°/s, and 30° is associated with 500°/s. Therefore, for larger amplitude ranges, the main sequence can best be modeled by an inverse power law function.

The high peak velocities and the main sequence relationship can also be used to distinguish micro-/saccades from other eye movements (like ocular tremor, ocular drift, and smooth pursuit). Velocity-based algorithms are a common approach for saccade detection in eye tracking. Although, depending on the demands on timing accuracy, acceleration-based methods are more precise.

Saccades may rotate the eyes in any direction to relocate gaze direction (the direction of sight that corresponds to the fovea), but normally saccades do not rotate the eyes torsionally. (Torsion is clockwise or counterclockwise rotation around the line of sight when the eye is at its central primary position; defined this way, Listing's law says that, when the head is motionless, torsion is kept at zero.)

Head-fixed saccades can have amplitudes of up to 90° (from one edge of the oculomotor range to the other), but in normal conditions saccades are far smaller, and any shift of gaze larger than about 20° is accompanied by a head movement. During such gaze saccades, first, the eye produces a saccade to get gaze on target, whereas the head follows more slowly and the vestibulo-ocular reflex (VOR) causes the eyes to roll back in the head to keep gaze on the target. Since the VOR can actually rotate the eyes around the line of sight, combined eye and head movements do not always obey Listing's law.

Types

Saccades can be categorized by intended goal in four ways:

  1. In a visually guided saccade, the eyes move toward a visual transient, or stimulus. The parameters of visually guided saccades (amplitude, latency, peak velocity, and duration) are frequently measured as a baseline when measuring other types of saccades. Visually guided saccades can be further subcategorized:
    • A reflexive saccade is triggered exogenously by the appearance of a peripheral stimulus, or by the disappearance of a fixation stimulus.
    • A scanning saccade is triggered endogenously for the purpose of exploring the visual environment.
  2. In an antisaccade, the eyes move away from the visual onset. They are more delayed than visually guided saccades, and observers often make erroneous saccades in the wrong direction. A successful antisaccade requires inhibiting a reflexive saccade to the onset location, and voluntarily moving the eye in the other direction.
  3. In a memory guided saccade, the eyes move toward a remembered point, with no visual stimulus.
  4. In a sequence of predictive saccades, the eyes are kept on an object moving in a temporally and/or spatially predictive manner. In this instance, saccades often coincide with (or anticipate) the predictable movement of an object.

As referenced to above, it is also useful to categorize saccades by latency (time between go-signal and movement onset). In this case the categorization is binary: Either a given saccade is an express saccade or it is not. The latency cut-off is approximately ~200 ms; any longer than this is outside the express saccade range.

Microsaccades are a related type of fixational eye movement that are small, jerk-like, involuntary eye movements, similar to miniature versions of voluntary saccades. They typically occur during visual fixation, not only in humans, but also in animals with foveal vision (primates, cats, etc.). Microsaccade amplitudes vary from 2 to 120 arcminutes.

In depth

When exploring the visual environment with the gaze, humans make two to three fixations a second. Each fixation involves binocularly coordinated movements of the eyes to acquire the new target in three dimensions: horizontal and vertical, but also in-depth. In literature it has been shown how an upward or a vertical saccade is generally accompanied by a divergence of the eyes, while a downward saccade is accompanied by a convergence. The amount of this intra-saccadic vergence has a strong functional significance for the effectiveness of binocular vision. When making an upward saccade, the eyes diverged to be aligned with the most probable uncrossed disparity in that part of the visual field. On the other way around, when making a downward saccade, the eyes converged to enable alignment with crossed disparity in that part of the field. The phenomenon can be interpreted as an adaptation of rapid binocular eye movements to the statistics of the 3D environment, in order to minimize the need for corrective vergence movements at the end of saccades.

Pathophysiologic saccades

Saccadic oscillations not fitting the normal function are a deviation from a healthy or normal condition. Nystagmus is characterized by the combination of 'slow phases', which usually take the eye off the point of regard, interspersed with saccade-like "quick phases" that serve to bring the eye back on target. Pathological slow phases may be due to either an imbalance in the vestibular system or damage to the brainstem "neural integrator" that normally holds the eyes in place. On the other hand, opsoclonus or ocular flutter are composed purely of fast-phase saccadic eye movements. Without the use of objective recording techniques, it may be very difficult to distinguish between these conditions.

Eye movement measurements are also used to investigate psychiatric disorders. For example, ADHD is characterized by an increase of antisaccade errors and an increase in delays for visually guided saccade. Various pathological conditions also alter microsaccades and other fixational eye movements.

Paroxysmal eye–head movements, termed aberrant gaze saccades, are an early symptom of GLUT1 deficiency syndrome in infancy.

Saccade adaptation

When the brain is led to believe that the saccades it is generating are too large or too small (by an experimental manipulation in which a saccade-target steps backward or forward contingent on the eye movement made to acquire it), saccade amplitude gradually decreases (or increases), an adaptation (also termed gain adaptation) widely seen as a simple form of motor learning, possibly driven by an effort to correct visual error. This effect was first observed in humans with ocular muscle palsy. In these cases, it was noticed that the patients would make hypometric (small) saccades with the affected eye, and that they were able to correct these errors over time. This led to the realization that visual or retinal error (the difference between the post-saccadic point of regard and the target position) played a role in the homeostatic regulation of saccade amplitude. Since then, much scientific research has been devoted to various experiments employing saccade adaptation.

Reading

Saccadic eye movement allows the mind to read quickly, but it comes with its disadvantages. It can cause the mind to skip over words because it does not see them as important to the sentence, and the mind completely leaves it from the sentence or it replaces it with the wrong word. This can be seen in "Paris in the the Spring". This is a common psychological test, where the mind will often skip the second "the", especially when there is a line break in between the two.

When speaking, the mind plans what will be said before it is said. Sometimes the mind is not able to plan in advance and the speech is rushed out. This is why there are errors like mispronunciation, stuttering, and unplanned pauses. The same thing happens when reading. The mind does not always know what will come next. This is another reason that the second "the" can be missed.

Vision

Saccadic masking

It is a common but false belief that during the saccade, no information is passed through the optic nerve to the brain. Whereas low spatial frequencies (the 'fuzzier' parts) are attenuated, higher spatial frequencies (an image's fine details) that would otherwise be blurred by the eye movement remain unaffected. This phenomenon, known as saccadic masking or saccadic suppression, is known to begin prior to saccadic eye movements in every primate species studied, implying neurological reasons for the effect rather than simply the image's motion blur. This phenomenon leads to the so-called stopped-clock illusion, or chronostasis.

A person may observe the saccadic masking effect by standing in front of a mirror and looking from one eye to the next (and vice versa). The subject will not experience any movement of the eyes or any evidence that the optic nerve has momentarily ceased transmitting. Due to saccadic masking, the eye/brain system not only hides the eye movements from the individual but also hides the evidence that anything has been hidden. Of course, a second observer watching the experiment will see the subject's eyes moving back and forth. The function's main purpose is to prevent an otherwise significant smearing of the image. (You can experience your eye saccade movements by using your cellphone's front-facing camera as a mirror, hold the cellphone screen a couple of inches away from your face as you saccade from one eye to the other—the cellphone's signal processing delay allows you to see the end of the saccade movement.)

Spatial updating

When a visual stimulus is seen before a saccade, subjects are still able to make another saccade back to that image, even if it is no longer visible. This shows that the brain is somehow able to take into account the intervening eye movement. It is thought that the brain does this by temporarily recording a copy of the command for the eye movement, and comparing this to the remembered image of the target. This is called spatial updating. Neurophysiologists, having recorded from cortical areas for saccades during spatial updating, have found that memory-related signals get remapped during each saccade.

Trans-saccadic perception

It is also thought that perceptual memory is updated during saccades so that information gathered across fixations can be compared and synthesized. However, the entire visual image is not updated during each saccade. Some scientists believe that this is the same as visual working memory, but as in spatial updating the eye movement has to be accounted for. The process of retaining information across a saccade is called trans-saccadic memory, and the process of integrating information from more than one fixation is called trans-saccadic integration.

Comparative physiology

Saccades are a widespread phenomenon across animals with image-forming visual systems. They have been observed in animals across three phyla, including animals that do not have a fovea (most vertebrates do) and animals that cannot move their eyes independently of their head (such as insects). Therefore, while saccades serve in humans and other primates to increase the effective visual resolution of a scene, there must be additional reasons for the behavior. The most frequently suggested of these reasons is to avoid blurring of the image, which would occur if the response time of a photoreceptor cell is longer than the time a given portion of the image is stimulating that photoreceptor as the image drifts across the eye.

In birds, saccadic eye movements serve a further function. The avian retina is highly developed. It is thicker than the mammalian retina, has a higher metabolic activity, and has less vasculature obstruction, for greater visual acuity. Because of this, the retinal cells must obtain nutrients via diffusion through the choroid and from the vitreous humor. The pecten is a specialised structure in the avian retina. It is a highly vascular structure that projects into the vitreous humor. Experiments show that, during saccadic eye oscillations (which occupy up to 12% of avian viewing time), the pecten oculi acts as an agitator, propelling perfusate (natural lubricants) toward the retina. Thus, in birds, saccadic eye movements appear to be important in retinal nutrition and cellular respiration.

Two-streams hypothesis

From Wikipedia, the free encyclopedia
https://en.wikipedia.org/wiki/Two-streams_hypothesis

The two-streams hypothesis is a model of the neural processing of vision as well as hearing. The hypothesis, given its initial characterisation in a paper by David Milner and Melvyn A. Goodale in 1992, argues that humans possess two distinct visual systems. Recently there seems to be evidence of two distinct auditory systems as well. As visual information exits the occipital lobe, and as sound leaves the phonological network, it follows two main pathways, or "streams". The ventral stream (also known as the "what pathway") leads to the temporal lobe, which is involved with object and visual identification and recognition. The dorsal stream (or, "how pathway") leads to the parietal lobe, which is involved with processing the object's spatial location relative to the viewer and with speech repetition.

History



The dorsal stream (green) and ventral stream (purple) are shown. They originate from a common source in the visual cortex

Several researchers had proposed similar ideas previously. The authors themselves credit the inspiration of work on blindsight by Weiskrantz, and previous neuroscientific vision research. Schneider first proposed the existence of two visual systems for localisation and identification in 1969. Ingle described two independent visual systems in frogs in 1973. Ettlinger reviewed the existing neuropsychological evidence of a distinction in 1990. Moreover, Trevarthen had offered an account of two separate mechanisms of vision in monkeys back in 1968.

In 1982, Ungerleider and Mishkin distinguished the dorsal and ventral streams, as processing spatial and visual features respectively, from their lesion studies of monkeys – proposing the original where vs what distinction. Though this framework was superseded by that of Milner & Goodale, it remains influential.

One hugely influential source of information that has informed the model has been experimental work exploring the extant abilities of visual agnosic patient D.F. The first, and most influential report, came from Goodale and colleagues in 1991 and work is still being published on her two decades later. This has been the focus of some criticism of the model due to the perceived over-reliance on findings from a single case.

Two visual systems

Goodale and Milner amassed an array of anatomical, neuropsychological, electrophysiological, and behavioural evidence for their model. According to their data, the ventral 'perceptual' stream computes a detailed map of the world from visual input, which can then be used for cognitive operations, and the dorsal 'action' stream transforms incoming visual information to the requisite egocentric (head-centered) coordinate system for skilled motor planning. The model also posits that visual perception encodes spatial properties of objects, such as size and location, relative to other objects in the visual field; in other words, it utilizes relative metrics and scene-based frames of reference. Visual action planning and coordination, on the other hand, uses absolute metrics determined via egocentric frames of reference, computing the actual properties of objects relative to the observer. Thus, grasping movements directed towards objects embedded in size-contrast-ambiguous scenes have been shown to escape the effects of these illusions, as different frames of references and metrics are involved in the perception of the illusion versus the execution of the grasping act.

Norman proposed a similar dual-process model of vision, and described eight main differences between the two systems consistent with other two-system models.

Factor Ventral system (what) Dorsal system (how)
Function Recognition/identification Visually guided behaviour
Sensitivity High spatial frequencies - details High temporal frequencies - motion
Memory Long-term stored representations Only very short-term storage
Speed Relatively slow Relatively fast
Consciousness Typically high Typically low
Frame of reference Allocentric or object-centered Egocentric or viewer-centered
Visual input Mainly foveal or parafoveal Across retina
Monocular vision Generally reasonably small effects Often large effects e.g. motion parallax

Dorsal stream

The dorsal stream is proposed to be involved in the guidance of actions and recognizing where objects are in space. The dorsal stream projects from the primary visual cortex to the posterior parietal cortex. It was initially termed the "where" pathway since it was thought that the dorsal stream processes information regarding the spatial properties of an object. However, later research conducted on a famous neuropsychological patient, Patient D.F., revealed that the dorsal stream is responsible for processing the visual information needed to construct the representations of objects one wishes to manipulate. Those findings led the nickname of the dorsal stream to be updated to the "how" pathway. The dorsal stream is interconnected with the parallel ventral stream (the "what" stream) which runs downward from V1 into the temporal lobe.

General features

The dorsal stream is involved in spatial awareness and guidance of actions (e.g., reaching). In this it has two distinct functional characteristics—it contains a detailed map of the visual field, and is also good at detecting and analyzing movements.

The dorsal stream commences with purely visual functions in the occipital lobe before gradually transferring to spatial awareness at its termination in the parietal lobe.

The posterior parietal cortex is essential for "the perception and interpretation of spatial relationships, accurate body image, and the learning of tasks involving coordination of the body in space".

It contains individually functioning lobules. The lateral intraparietal sulcus (LIP) contains neurons that produce enhanced activation when attention is moved onto the stimulus or the animal saccades towards a visual stimulus, and the ventral intraparietal sulcus (VIP) where visual and somatosensory information are integrated.

Effects of damage or lesions

Damage to the posterior parietal cortex causes a number of spatial disorders including:

  • Simultanagnosia: where the patient can only describe single objects without the ability to perceive it as a component of a set of details or objects in a context (as in a scenario, e.g. the forest for the trees).
  • Optic ataxia: where the patient can't use visuospatial information to guide arm movements.
  • Hemispatial neglect: where the patient is unaware of the contralesional half of space (that is, they are unaware of things in their left field of view and focus only on objects in the right field of view; or appear unaware of things in one field of view when they perceive them in the other). For example, a person with this disorder may draw a clock, and then label all twelve of the numbers on one side of the face and consider the drawing complete.
  • Akinetopsia: inability to perceive motion.
  • Apraxia: inability to produce discretionary or volitional movement in the absence of muscular disorders.

Ventral stream

The ventral stream is associated with object recognition and form representation. Also described as the "what" stream, it has strong connections to the medial temporal lobe (which is associated with long-term memories), the limbic system (which controls emotions), and the dorsal stream (which deals with object locations and motion).

The ventral stream gets its main input from the parvocellular (as opposed to magnocellular) layer of the lateral geniculate nucleus of the thalamus. These neurons project to V1 sublayers 4Cβ, 4A, 3B and 2/3a successively. From there, the ventral pathway goes through V2 and V4 to areas of the inferior temporal lobe: PIT (posterior inferotemporal), CIT (central inferotemporal), and AIT (anterior inferotemporal). Each visual area contains a full representation of visual space. That is, it contains neurons whose receptive fields together represent the entire visual field. Visual information enters the ventral stream through the primary visual cortex and travels through the rest of the areas in sequence.

Moving along the stream from V1 to AIT, receptive fields increase their size, latency, and the complexity of their tuning. For example, recent studies have shown that the V4 area is responsible for color perception in humans, and the V8 (VO1) area is responsible for shape perception, while the VO2 area, which is located between these regions and the parahippocampal cortex, integrates information about the color and shape of stimuli into a holistic image.

All the areas in the ventral stream are influenced by extraretinal factors in addition to the nature of the stimulus in their receptive field. These factors include attention, working memory, and stimulus salience. Thus the ventral stream does not merely provide a description of the elements in the visual world—it also plays a crucial role in judging the significance of these elements.

Damage to the ventral stream can cause inability to recognize faces or interpret facial expression.

Two auditory systems

Ventral stream

comprehension of the phrase 'my cat' in the extended version of Hickok and Poeppel's dual pathway model

Along with the visual ventral pathway being important for visual processing, there is also a ventral auditory pathway emerging from the primary auditory cortex. In this pathway, phonemes are processed posteriorly to syllables and environmental sounds. The information then joins the visual ventral stream at the middle temporal gyrus and temporal pole. Here the auditory objects are converted into audio-visual concepts.

Dorsal stream

The function of the auditory dorsal pathway is to map the auditory sensory representations onto articulatory motor representations. Hickok & Poeppel claim that the auditory dorsal pathway is necessary because, "learning to speak is essentially a motor learning task. The primary input to this is sensory, speech in particular. So, there must be a neural mechanism that both codes and maintains instances of speech sounds, and can use these sensory traces to guide the tuning of speech gestures so that the sounds are accurately reproduced."

repetition of the phrase 'what is your name?' in the extended version of Hickok and Poeppel's dual pathway model

In contrast to the ventral stream's auditory processing, information enters from the primary auditory cortex into the posterior superior temporal gyrus and posterior superior temporal sulcus. From there the information moves to the beginning of the dorsal pathway, which is located at the boundary of the temporal and parietal lobes near the Sylvian fissure. The first step of the dorsal pathway begins in the sensorimotor interface, located in the left Sylvian parietal temporal (Spt) (within the Sylvian fissure at the parietal-temporal boundary). The spt is important for perceiving and reproducing sounds. This is evident because its ability to acquire new vocabulary, be disrupted by lesions and auditory feedback on speech production, articulatory decline in late-onset deafness and the non-phonological residue of Wernicke's aphasia; deficient self-monitoring. It is also important for the basic neuronal mechanisms for phonological short-term memory. Without the Spt, language acquisition is impaired. The information then moves onto the articulatory network, which is divided into two separate parts. The articulatory network 1, which processes motor syllable programs, is located in the left posterior inferior temporal gyrus and Brodmann's area 44 (pIFG-BA44). The articulatory network 2 is for motor phoneme programs and is located in the left M1-vBA6.

Conduction aphasia affects a subject's ability to reproduce speech (typically by repetition), though it has no influence on the subject's ability to comprehend spoken language. This shows that conduction aphasia must reflect not an impairment of the auditory ventral pathway but instead of the auditory dorsal pathway. Buchsbaum et al found that conduction aphasia can be the result of damage, particularly lesions, to the Spt (Sylvian parietal temporal). This is shown by the Spt's involvement in acquiring new vocabulary, for while experiments have shown that most conduction aphasiacs can repeat high-frequency, simple words, their ability to repeat low-frequency, complex words is impaired. The Spt is responsible for connecting the motor and auditory systems by making auditory code accessible to the motor cortex. It appears that the motor cortex recreates high-frequency, simple words (like cup) in order to more quickly and efficiently access them, while low-frequency, complex words (like Sylvian parietal temporal) require more active, online regulation by the Spt. This explains why conduction aphasiacs have particular difficulty with low-frequency words which requires a more hands-on process for speech production. "Functionally, conduction aphasia has been characterized as a deficit in the ability to encode phonological information for production," namely because of a disruption in the motor-auditory interface. Conduction aphasia has been more specifically related to damage of the arcuate fasciculus, which is vital for both speech and language comprehension, as the arcuate fasiculus makes up the connection between Broca and Wernicke's areas.

Criticisms

Goodale & Milner's innovation was to shift the perspective from an emphasis on input distinctions, such as object location versus properties, to an emphasis on the functional relevance of vision to behaviour, for perception or for action. Contemporary perspectives however, informed by empirical work over the past two decades, offer a more complex account than a simple separation of function into two-streams. Recent experimental work for instance has challenged these findings, and has suggested that the apparent dissociation between the effects of illusions on perception and action is due to differences in attention, task demands, and other confounds. There are other empirical findings, however, that cannot be so easily dismissed which provide strong support for the idea that skilled actions such as grasping are not affected by pictorial illusions.

Moreover, recent neuropsychological research has questioned the validity of the dissociation of the two streams that has provided the cornerstone of evidence for the model. The dissociation between visual agnosia and optic ataxia has been challenged by several researchers as not as strong as originally portrayed; Hesse and colleagues demonstrated dorsal stream impairments in patient DF; Himmelbach and colleagues reassessed DF's abilities and applied more rigorous statistical analysis demonstrating that the dissociation wasn't as strong as first thought.

A 2009 review of the accumulated evidence for the model concluded that whilst the spirit of the model has been vindicated the independence of the two streams has been overemphasised. Goodale & Milner themselves have proposed the analogy of tele-assistance, one of the most efficient schemes devised for the remote control of robots working in hostile environments. In this account, the dorsal stream is viewed as a semi-autonomous function that operates under guidance of executive functions which themselves are informed by ventral stream processing.

Thus the emerging perspective within neuropsychology and neurophysiology is that, whilst a two-systems framework was a necessary advance to stimulate study of the highly complex and differentiated functions of the two neural pathways; the reality is more likely to involve considerable interaction between vision-for-action and vision-for-perception. Robert McIntosh and Thomas Schenk summarize this position as follows:

We should view the model not as a formal hypothesis, but as a set of heuristics to guide experiment and theory. The differing informational requirements of visual recognition and action guidance still offer a compelling explanation for the broad relative specializations of dorsal and ventral streams. However, to progress the field, we may need to abandon the idea that these streams work largely independently of one other, and to address the dynamic details of how the many visual brain areas arrange themselves from task to task into novel functional networks.

Representation of a Lie group

From Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Representation_of_a_Lie_group...