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Thursday, June 20, 2019

Lynching

From Wikipedia, the free encyclopedia

Lynching is a premeditated extrajudicial killing by a group. It is most often used to characterize informal public executions by a mob in order to punish an alleged transgressor, or to intimidate a group. It can also be an extreme form of informal group social control, and it is often conducted with the display of a public spectacle for maximum intimidation. Instances of lynchings and similar mob violence can be found in every society.

In the United States, lynchings of African Americans became frequent in the South during the period after the Reconstruction era into the 20th century. Lynchings are common in many contemporary societies, particularly in countries with high crime rates such as Brazil, Guatemala and South Africa.

Etymology

The origins of the word "lynch" are obscure, but it likely originated during the American revolution. The verb comes from the phrase "Lynch Law", a term for a punishment without trial. Two Americans during this era are generally credited for coining the phrase: Charles Lynch (1736-1796) and William Lynch, who both lived in Virginia in the 1780s. Charles Lynch is more likely to have coined the phrase, as he was known to have used the term in 1782, while William Lynch is not known to have used the term until much later. There is no evidence that death was imposed as a punishment by either of the two men. In 1782, Charles Lynch wrote that his assistant had administered "Lynch's law" to Tories "for Dealing with Negroes, &c."

Charles Lynch was a Virginia Quaker, planter, and American Revolutionary who headed a county court in Virginia which imprisoned Loyalist supporters of the British for up to one year during the war. Although he lacked proper jurisdiction for detaining these persons, he claimed this right by arguing wartime necessity. Subsequently, he prevailed upon his friends in the Congress of the Confederation to pass a law that exonerated him and his associates from wrongdoing. He was concerned that he might face legal action from one or more of those he had imprisoned, notwithstanding the American Colonies had won the war. This action by the Congress provoked controversy, and it was in connection with this that the term "Lynch law", meaning the assumption of extrajudicial authority, came into common parlance in the United States. Lynch was not accused of racist bias. He acquitted blacks accused of murder on three separate occasions. He was accused, however, of ethnic prejudice in his abuse of Welsh miners.

William Lynch (1742–1820) from Virginia claimed that the phrase was first used in a 1780 compact signed by him and his neighbors in Pittsylvania County. While Edgar Allan Poe claimed that he found this document, it was probably a hoax.

A 17th-century legend of James Lynch fitz Stephen, who was Mayor of Galway in Ireland in 1493, says that when his son was convicted of murder, the mayor hanged him from his own house. The story was proposed by 1904 as the origin of the word "lynch". It is dismissed by etymologists, both because of the distance in time and place from the alleged event to the word's later emergence, and because the incident did not constitute a lynching in the modern sense.

The archaic verb linch, to beat severely with a pliable instrument, to chastise or to maltreat, has been proposed as the etymological source; but there is no evidence that the word has survived into modern times, so this claim is also considered implausible.

History

Rioters breaking into a parish prison during anti-Italian lynchings in New Orleans, Louisiana, in 1891
 
Every society has had forms of extrajudicial punishments, including murder. The legal and cultural antecedents of American lynching were carried across the Atlantic by migrants from the British Isles to colonial North America. Collective violence was a familiar aspect of the early modern Anglo-American legal landscape. Group violence in the British Atlantic was usually nonlethal in intention and result. In the seventeenth century, in the context of political turmoil in England and unsettled social and political conditions in the American colonies, there arose rebellions and riots that took multiple lives. In the United States, during the decades before the Civil War (sometimes called the Antebellum era), free Blacks, Latinos in the South West, and runaways were the objects of racial lynching.

But lynching attacks on U.S. blacks, especially in the South, increased dramatically in the aftermath of Reconstruction, after slavery had been abolished and freed men gained the right to vote. The peak of lynchings occurred in 1892, after southern white Democrats had regained control of state legislatures. Many incidents were related to economic troubles and competition. At the turn of the 20th century, southern states passed new constitutions or legislation which effectively disenfranchised most blacks and many poor whites, established segregation of public facilities by race, and separated blacks from common public life and facilities through Jim Crow rules. Nearly 3,500 African Americans and 1,300 whites were lynched in the United States between 1882 and 1968.

Lynching in the British Empire during the 19th century coincided with a period of violence which denied people participation in white-dominated society on the basis of race after the Emancipation Act of 1833.

United States

Bodies of three men lynched in Georgia, May 1892.
 
Lynchings took place in the United States both before and after the American Civil War, most commonly in Southern states and Western frontier settlements and most frequently in the late 19th century. It was performed without due process of law by self-appointed commissions, mobs, or vigilantes as a form of punishment for presumed criminal offences. At the first recorded lynching, in St. Louis in 1835, a black man named McIntosh who killed a deputy sheriff while being taken to jail was captured, chained to a tree, and burned to death on a corner lot downtown in front of a crowd of over 1,000 people.

In the South in the antebellum era, members of the abolitionist movement or other people who opposed slavery were sometimes victims of mob violence. The largest lynching during the war and perhaps the largest lynching in all of U.S. history, was the lynching of 41 men in the Great Hanging at Gainesville, Texas in October 1862. Most of the victims were hanged after an extrajudicial "trial" but at least fourteen of them did not receive that formality. The men had been accused of insurrection or treason. Five more men were hanged in Decatur, Texas as part of the same sweep.

After the war, southern whites struggled to maintain their social dominance. Secret vigilante and insurgent groups such as the Ku Klux Klan (KKK) instigated extrajudicial assaults and killings in order to keep whites in power and discourage freedmen from voting, working and getting educated. They also sometimes attacked Northerners, teachers, and agents of the Freedmen's Bureau. A study of the period from 1868 to 1871 estimates that the KKK was involved in more than 400 lynchings. The aftermath of the war was a period of upheaval and social turmoil, in which most white men had been war veterans. Mobs usually alleged crimes for which they lynched blacks. In the late 19th century, however, journalist Ida B. Wells showed that many presumed crimes were either exaggerated or had not even occurred.

The lynching of Laura Nelson in Okemah, Oklahoma, on May 25, 1911
 
From the 1890s onwards, the majority of those lynched were black, including at least 159 women. Between 1882 and 1968, the Tuskegee Institute recorded 1,297 lynchings of whites and 3,446 lynchings of blacks. However, lynchings of members of other ethnic groups, such as Mexicans and Chinese, were undercounted in the Tuskegee Institute's records. One of the largest mass lynchings in American history occurred in 1891, when a mob lynched eleven Italian immigrants in New Orleans, Louisiana, following their acquittal on charges that they had killed the local police chief. The largest lynching was the Chinese massacre of 1871

Mob violence arose as a means of enforcing white supremacy and it frequently verged on systematic political terrorism. "The Ku Klux Klan, paramilitary groups, and other whites united by frustration and anger ruthlessly defended the interests of white supremacy. The magnitude of the extralegal violence which occurred during election campaigns reached epidemic proportions, leading the historian William Gillette to label it guerrilla warfare."

Body of a lynched black male, propped up in a rocking chair for a photograph, circa 1900. Paint has been applied to his face, circular disks glued to his cheeks, cotton glued to his face and head, while a rod props up the victim's head.
 
During Reconstruction, the Ku Klux Klan and others used lynching as a means to control blacks, forcing them to work for planters and preventing them from exercising their right to vote. Federal troops and courts enforcing the Civil Rights Act of 1871 largely broke up the Reconstruction-era Klan. 

By the end of Reconstruction in 1877, with fraud, intimidation and violence at the polls, white Democrats regained nearly total control of the state legislatures across the South. They passed laws to make voter registration more complicated, reducing black voters on the rolls. In the late 19th and early 20th centuries, from 1890 to 1908, ten of eleven Southern legislatures ratified new constitutions and amendments to effectively disenfranchise most African Americans and many poor whites through devices such as poll taxes, property and residency requirements, and literacy tests. Although required of all voters, some provisions were selectively applied against African Americans. In addition, many states passed grandfather clauses to exempt white illiterates from literacy tests for a limited period. The result was that black voters were stripped from registration rolls and without political recourse. Since they could not vote, they could not serve on juries. They were without official political voice. 

The ideology behind lynching, directly connected with the denial of political and social equality, was stated forthrightly by Benjamin Tillman, governor of South Carolina and later a United States Senator:
We of the South have never recognized the right of the negro to govern white men, and we never will. We have never believed him to be the equal of the white man, and we will not submit to his gratifying his lust on our wives and daughters without lynching him.
The lynching of African American Will James in Cairo, Illinois, on November 11, 1909. A crowd of thousands watched the lynching.
 
Postcard of the 1920 Duluth, Minnesota lynchings. Two of the black victims are still hanging while the third is on the ground. Postcards of lynchings were popular souvenirs in the U.S.
 
Lynchings declined briefly after the takeover in the 1870s. By the end of the 19th century, with struggles over labor and disenfranchisement, and continuing agricultural depression, lynchings rose again. The number of lynchings peaked at the end of the 19th century, but these kinds of murders continued into the 20th century. Tuskegee Institute records of lynchings between the years 1880 and 1951 show 3,437 African-American victims, as well as 1,293 white victims. Lynchings were concentrated in the Cotton Belt (Mississippi, Georgia, Alabama, Texas and Louisiana).

Due to the high rate of lynching, racism, and lack of political and economic opportunities in the South, many black southerners decided to live outside the South to escape these conditions. From 1910 to 1940, 1.5 million southern blacks migrated to urban and industrial Northern cities such as New York City, Chicago, Detroit, Cincinnati, Boston, and Pittsburgh during the Great Migration. The rapid influx of southern blacks into the North disturbed the racial balance within Northern cities, exacerbating hostility between both black and white Northerners. Many whites defended their space with violence, intimidation, or legal tactics toward blacks, while many other whites migrated to more racially homogeneous regions, a process known as white flight. Overall, blacks in Northern cities experienced systemic discrimination in a plethora of aspects of life. Throughout this period, racial tensions exploded, most violently in Chicago, and lynchings—mob-directed hangings—increased dramatically in the 1920s.

African Americans resisted through protests, marches, lobbying Congress, writing of articles, rebuttals of so-called justifications of lynching, organizing women's groups against lynching, and getting integrated groups against lynching. African-American playwrights produced 14 anti-lynching plays between 1916 and 1935, ten of them by women. 

After the release of the movie The Birth of a Nation (1915), which glorified lynching and the Reconstruction-era Klan, the Klan re-formed. Unlike its earlier form, it was heavily represented among urban populations, especially in the Midwest. In response to a large number of mainly Catholic and Jewish immigrants from Southern and Eastern Europe, the Klan espoused an anti-immigrant, anti-Catholic and anti-Jewish stance, in addition to exercising the oppression of blacks.

Members of mobs that participated in lynchings often took photographs of what they had done to their victims in order to spread awareness and fear of their power. Some of those photographs were published and sold as postcards. In 2000, James Allen published a collection of 145 lynching photos in book form as well as online, with written words and video to accompany the images.

Dyer Bill

The Dyer Anti-Lynching Bill was first introduced to the United States Congress in 1918 by Republican Congressman Leonidas C. Dyer of St. Louis, Missouri. The bill was passed by the United States House of Representatives in 1922, and in the same year it was given a favorable report by the United States Senate Committee. Its passage was blocked by white Democratic senators from the Solid South, the only representatives elected since the southern states had disenfranchised African Americans around the start of the 20th century. The Dyer Bill influenced later anti-lynching legislation, including the Costigan-Wagner Bill. The Dyer and Costigan Wagner bills were blocked by Senator William Borah (R-ID).

As passed by the House, the Dyer Anti-Lynching Bill stated:
"To assure to persons within the jurisdiction of every State the equal protection of the laws, and to punish the crime of lynching.... Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That the phrase 'mob or riotous assemblage,' when used in this act, shall mean an assemblage composed of three or more persons acting in concert for the purpose of depriving any person of his life without authority of law as a punishment for or to prevent the commission of some actual or supposed public offense."

Decline and Civil Rights Movement

While the frequency of lynching dropped in the 1930s, there was a spike in 1930 during the Great Depression. For example, in North Texas and southern Oklahoma alone, four people were lynched in separate incidents in less than a month. In his book Russia Today: What Can We Learn from It? (1934), Sherwood Eddy wrote: "In the most remote villages of Russia today Americans are frequently asked what they are going to do to the Scottsboro Negro boys and why they lynch Negroes." A spike in lynchings occurred after World War II, as tensions arose after veterans returned home. Whites tried to re-impose white supremacy over returning black veterans. The last documented mass lynching occurred in Walton County, Georgia, in 1946, when two war veterans and their wives were killed by local white landowners. 

By the 1950s, the Civil Rights Movement was gaining new momentum. It was spurred by the lynching of Emmett Till, a 14-year-old youth from Chicago who was killed while visiting an uncle in Mississippi. His mother insisted on having an open-casket funeral so that people could see how badly her son had been beaten. The black community throughout the U.S. became mobilized. Vann R. Newkirk wrote "the trial of his killers became a pageant illuminating the tyranny of white supremacy". The state of Mississippi tried two defendants, but they were acquitted by an all-white jury.

David Jackson writes that it was the photograph of the "child’s ravaged body, that forced the world to reckon with the brutality of American racism." Soviet media frequently covered racial discrimination in the U.S. Deeming American criticism of Soviet Union human rights abuses at this time as hypocrisy, the Russians responded with "And you are lynching Negroes". In Cold War Civil Rights: Race and the Image of American Democracy (2001), the historian Mary L. Dudziak wrote that Soviet Communist criticism of racial discrimination and violence in the United States influenced the federal government to support civil rights legislation.

Most, but not all, lynchings ceased by the 1960s. The murder of James Craig Anderson in Mississippi in 2011 was the last recorded fatal lynching in the United States. Jasmine Richards was convicted of "lynching" in 2016, but her conviction was for "taking by means of a riot of any person from the lawful custody of a peace officer" (California penal code 405a), not for killing anybody.

Civil rights law

Title 18, U.S.C., Section 241, is the civil rights conspiracy statute, which makes it unlawful for two or more persons to conspire to injure, oppress, threaten, or intimidate any person of any state, territory, or district in the free exercise or enjoyment of any right or privilege secured to him/her by the Constitution or the laws of the United States (or because of his/her having exercised the same) and further makes it unlawful for two or more persons to go in disguise on the highway or premises of another person with intent to prevent or hinder his or her free exercise or enjoyment of such rights. Depending upon the circumstances of the crime, and any resulting injury, the offense is punishable by a range of fines and/or imprisonment for any term of years up to life, or the death penalty.

Felony lynching

The term 'felony lynching' was used in California law. It described the act of taking someone out of the custody of a police officer by "means of riot". It does not refer to the act of lynching, or murder by physical violence. This statute has been used to charge individuals who have tried to free someone from police custody. There have been several notable cases in the twenty-first century, some controversial, when a black person has attempted to free another black person from police custody. In 2015, Governor Jerry Brown signed legislation by Senator Holly Mitchell removing the word "lynching" from the state's criminal code without comment after it received unanimous approval in a vote by state lawmakers. Mitchell stated, "It's been said that strong words should be reserved for strong concepts, and 'lynching' has such a painful history for African Americans that the law should only use it for what it is – murder by mob." The law was otherwise unchanged.

Effects

A 2017 study found that exposure to lynchings in the post-Reconstruction South "reduced local black voter turnout by roughly 2.5 percentage points." There was other violence directed at blacks, particularly in campaign season. Most significantly for voting, from 1890 to 1908, southern states passed new constitutions and laws that disenfranchised most blacks due to barriers to voter registration. These actions had major effects, soon reducing black voter turnout in most of the South to insignificant amounts.

Another 2017 study found supportive evidence of Stewart Tolnay and E. M. Beck's claim that lynchings were "due to economic competition between African American and white cotton workers". The study found that lynchings were associated with greater black out-migration from 1920 to 1930, and higher state-level wages.

Europe

September Massacres of 1792, in which Parisian mobs killed hundreds of royalist prisoners.
 
In Britain, a series of race riots broke out in several cities in 1919 between whites and black sailors. In Liverpool, after a black sailor had been stabbed by two whites in a pub, his friends attacked the pub in revenge. In response, the police raided lodging houses with black occupants, accompanied by an "enraged lynch mob". Charles Wootton, a young black seaman who had not been involved in the attacks, was chased into the river Mersey and drowned after being pelted with missiles thrown by the mob, who chanted "Let him drown!" The Charles Wootton College in Liverpool was named in his memory.

In 1944, Wolfgang Rosterg, a German prisoner of war known to be unsympathetic to the Nazi regime, was lynched by Nazis in POW Camp 21 in Comrie, Scotland. At the end of the war, five of the perpetrators were hanged at Pentonville Prison – the largest multiple execution in 20th-century Britain.

The situation is less clear with regards to reported "lynchings" in Germany. Nazi propaganda sometimes tried to depict state-sponsored violence as spontaneous lynchings. The most notorious instance of this was "Kristallnacht", which the government portrayed as the result of "popular wrath" against Jews, but it was carried out in an organised and planned manner, mainly by SS men. Similarly, the approximately 150 confirmed murders of surviving crew members of crashed Allied aircraft in revenge for what Nazi propaganda called "Anglo-American bombing terror" were chiefly conducted by German officials and members of the police or the Gestapo, although civilians sometimes took part in them. The execution of enemy aircrew without trial in some cases had been ordered by Hitler personally in May 1944. Publicly it was announced that enemy pilots would no longer be protected from "public wrath". There were secret orders issued that prohibited policemen and soldiers from interfering in favor of the enemy in conflicts between civilians and Allied forces, or prosecuting civilians who engaged in such acts. In summary,
"the assaults on crashed allied aviators were not typically acts of revenge for the bombing raids which immediately preceded them. [...] The perpetrators of these assaults were usually National Socialist officials, who did not hesitate to get their own hands dirty. The lynching murder in the sense of self-mobilizing communities or urban quarters was the exception."
Lynching of members of the Turkish Armed Forces occurred in the aftermath of the 2016 Turkish coup d'état attempt.

Mexico

On November 23, 2004, in the Tlahuac lynching, three Mexican undercover federal agents investigating a narcotics-related crime were lynched in the town of San Juan Ixtayopan (Mexico City) by an angry crowd who saw them taking photographs and suspected that they were trying to abduct children from a primary school. The agents immediately identified themselves but they were held and beaten for several hours before two of them were killed and set on fire. The incident was covered by the media almost from the beginning, including their pleas for help and their murder. 

By the time police rescue units arrived, two of the agents were reduced to charred corpses and the third was seriously injured. Authorities suspect that the lynching was provoked by the persons who were being investigated. Both local and federal authorities had abandoned the agents, saying that the town was too far away for them to try to intervene. Some officials said they would provoke a massacre if the authorities tried to rescue the men from the mob.

Brazil

According to The Wall Street Journal, "Over the past 60 years, as many as 1.5 million Brazilians have taken part in lynchings...In Brazil, mobs now kill—or try to kill—more than one suspected lawbreaker a day, according to University of São Paulo sociologist José de Souza Martins, Brazil’s leading expert on lynchings."

Guatemala

In May 2015, a sixteen-year-old girl was lynched in Rio Bravo by a vigilante mob after being accused of involvement in the killing of a taxi driver earlier in the month.

Dominican Republic

Extrajudicial punishment, including lynching, of alleged criminals who committed various crimes, ranging from theft to murder, has some endorsement in Dominican society. According to a 2014 Latinobarómetro survey, the Dominican Republic had the highest rate of acceptance in Latin America of such unlawful measures. These issues are particularly evident in the Northern Region.

Haiti

After the 2010 earthquake the slow distribution of relief supplies and the large number of affected people created concerns about civil unrest, marked by looting and mob justice against suspected looters. In a 2010 news story, CNN reported, "At least 45 people, most of them Vodou priests, have been lynched in Haiti since the beginning of the cholera epidemic by angry mobs blaming them for the spread of the disease, officials said.

South Africa

The practice of whipping and necklacing offenders and political opponents evolved in the 1980s during the apartheid era in South Africa. Residents of black townships formed "people's courts" and used whip lashings and deaths by necklacing in order to terrorize fellow blacks who were seen as collaborators with the government. Necklacing is the torture and execution of a victim by igniting a kerosene-filled rubber tire that has been forced around the victim's chest and arms. Necklacing was used to punish victims who were alleged to be traitors to the black liberation movement along with their relatives and associates. Sometimes the "people's courts" made mistakes, or they used the system to punish those whom the anti-Apartheid movement's leaders opposed. A tremendous controversy arose when the practice was endorsed by Winnie Mandela, then the wife of the then-imprisoned Nelson Mandela and a senior member of the African National Congress.

More recently, drug dealers and other gang members have been lynched by People Against Gangsterism and Drugs, a vigilante organization.

Nigeria

The practice of extrajudicial punishments, including lynching, is referred to as 'jungle justice' in Nigeria. The practice is widespread and "an established part of Nigerian society", predating the existence of the police. Exacted punishments vary between a "muddy treatment", that is, being made to roll in the mud for hours and severe beatings followed by necklacing. The case of the Aluu four sparked national outrage. The absence of a functioning judicial system and law enforcement, coupled with corruption are blamed for the continuing existence of the practice.

Palestinian territories

Palestinian lynch mobs have murdered Palestinians suspected of collaborating with Israel. According to a Human Rights Watch report from 2001:
During the First Intifada, before the PA was established, hundreds of alleged collaborators were lynched, tortured or killed, at times with the implied support of the PLO. Street killings of alleged collaborators continue into the current intifada ... but at much fewer numbers.
2000 Ramallah lynching
In October 2000, two Israeli reservists, serving as drivers, mistakenly entered Ramallah and were killed by a Palestinian crowd. Their bodies were mutilated and dragged to Al-Manara Square in the city center. Palestinian policemen did not prevent, and in some cases actually took part in the lynching.

Israel

On October 12, 2000, the infamous and brutal Ramallah lynching, took place. This happened at the el-Bireh police station, where a Palestinian crowd killed and mutilated the bodies of two Israel Defense Forces reservists, Vadim Norzhich (Nurzhitz) and Yosef "Yossi" Avrahami, who had accidentally entered the Palestinian Authority-controlled city of Ramallah in the West Bank and were taken into custody by Palestinian Authority policemen. The Israeli reservists were beaten and stabbed. At this point, a Palestinian (later identified as Aziz Salha), appeared at the window, displaying his blood-soaked hands to the crowd, which erupted into cheers. The crowd clapped and cheered as one of the soldier's bodies was then thrown out the window and stamped and beaten by the frenzied crowd. One of the two was shot, set on fire, and his head beaten to a pulp. Soon after, the crowd dragged the two mutilated bodies to Al-Manara Square in the city center and began an impromptu victory celebration. Police officers proceeded to try and confiscate footage from reporters.

In July 2014, three Israeli men kidnapped Mohammed Abu Khdeir, a 16-year-old Palestinian, while he was waiting for dawn Ramadan prayers outside of his house in Eastern Jerusalem. They forced him into their car and beat him while driving to the deserted forest area new Jerusalem, then poured gasoline on him and set him on fire after being tortured and beat multiple times. On 30 November 2015, the two minors involved were found guilty of Khdeirs' murder, and were respectively sentenced to life and 21 years imprisonment on 4 February. On 3 May 2016, Ben David was sentenced to life in prison and an additional 20 years.

Afghanistan

On March 19, 2015 in Kabul, Afghanistan a large crowd beat a young woman, Farkhunda, after she was accused by a local mullah of burning a copy of the Quran, Islam's holy book. Shortly afterwards, a crowd attacked her and beat her to death. They set the young woman's body on fire on the shore of the Kabul River. Although it was unclear whether the woman had burned the Quran, police officials and the clerics in the city defended the lynching, saying that the crowd had a right to defend their faith at all costs. They warned the government against taking action against those who had participated in the lynching. The event was filmed and shared on social media. The day after the incident six men were arrested on accusations of lynching, and Afghanistan's government promised to continue the investigation. On March 22, 2015, Farkhunda's burial was attended by a large crowd of Kabul residents; many demanded that she receive justice. A group of Afghan women carried her coffin, chanted slogans and demanded justice.

India

In India, lynchings may reflect internal tensions between ethnic communities, communities sometimes lynch accused or suspicious convicts. An example is the 2006 Kherlanji massacre, where four members of a Dalit caste family were slaughtered by Kunbi caste members in Khairlanji, a village in the Bhandara district of Maharashtra. Though this incident was reported as an example of "upper" caste violence against members of a "lower" caste, it was found to be an example of communal violence. It was retaliation against a family who had opposed the Eminent Domain seizure of its fields so a road could be built that would have benefitted the group who murdered them. The women of the family were paraded naked in public, before being mutilated and murdered. Sociologists and social scientists reject attributing racial discrimination to the caste system and attributed this and similar events to intra-racial ethno-cultural conflicts.

There have been numerous lynchings in relation to cow vigilante violence in India since 2014, mainly involving Hindu mobs lynching Indian Muslims and Dalits. Some notable examples of such attacks include the 2015 Dadri mob lynching, the 2016 Jharkhand mob lynching, and the 2017 Alwar mob lynching. Mob lynching was reported for the third time in Alwar in July 2018, when a group of cow vigilantes killed a 31 year old Muslim man named Rakbar Khan.

In the 2015 Dimapur mob lynching, a mob in Dimapur, Nagaland, broke into a jail and lynched an accused rapist on 5 March 2015 while he was awaiting trial.

Since May 2017, when seven people were lynched in Jharkhand, India has experienced another spate of mob-related violence and killings known as the Indian Whatsapp lynchings following the spread of fake news, primarily relating to child-abduction and organ harvesting, via the Whatsapp message service.

In popular culture

"Strange Fruit"

In 1937, Abel Meeropol, a Jewish schoolteacher from New York, saw a copy of the photograph of a lynching in Marion, Indiana. He said that the photograph "haunted me for days" and inspired him to write the poem "Strange Fruit". It was published in the New York Teacher and later in the magazine New Masses, in both cases under the pseudonym Lewis Allan. This poem was set to music, also written by Meeropol, and the song was performed and popularized by Billie Holiday. The song reached 16th place on the charts in July 1939. The song has been performed by many other singers, including Nina Simone

A painting depicting the phases of the murder of the De Witts.

The Hateful Eight

The finale of the 2015 film The Hateful Eight set in post Civil War America is a detailed and close focused depiction of the lynching of a white woman, prompting some debate about whether it is a political commentary on racism and hate in America or if it was simply created for entertainment value.

de Witt Assassination (The Netherlands, 1672)

Dutch politicians Johan de Witt and his brother Cornelis were assassinated by a carefully organised lynch mob in 1672. A Dutch biographial film, Michiel de Ruyter, called Admiral in the English version, depicts the lynching and the background history.

Literature

Video games

Animal psychopathology

From Wikipedia, the free encyclopedia

Animal psychopathology is the study of mental or behavioral disorders in animals.

Historically, there has been an anthropocentric tendency to emphasize the study of animal psychopathologies as models for human mental illnesses. But animal psychopathologies can, from an evolutionary point of view, be more properly regarded as non-adaptive behaviors due to some sort of a cognitive disability, emotional impairment or distress. This article provides a non-exhaustive list of animal psychopathologies.

Eating disorders

Animals in the wild appear to be relatively free from eating disorders although their body composition fluctuates depending on seasonal and reproductive cycles. However, domesticated animals including farm, laboratory, and pet animals are prone to disorders. Evolutionary fitness drives feeding behavior in wild animals. The expectation is that farm animals also display this behavior, but questions arise if the same principles apply to laboratory and pet animals.

Activity anorexia

Activity anorexia (AA) is a condition where rats begin to exercise excessively while simultaneously cutting down on their food intake, similar to human anorexia nervosa or hypergymnasia. When given free access to food and an exercise wheel, rats normally develop a balanced routine between exercise and food intake, which turns them into fit rats. However, if food intake is restricted and wheel access is unrestricted, rats begin to exercise more and eat less, resulting in excessive weight loss and, ultimately, death. The running cycles shift so that most of the running is done in hours before feeding is scheduled. In other conditions, AA does not develop. Unrestricted food access and restricted wheel access will not cause any significant change in either feeding or exercise routine. Also, if rats are restricted both in food intake and wheel access, they will adjust accordingly. In fact, if rats are first trained to the feeding schedule and then given unrestricted access to a running wheel, they will not develop AA behavior. Results support the notion that the running interferes with adaptation to the new feeding schedule and is associated with the reward system in the brain. One theory is that running simulates foraging, a natural behavior in wild rats. Laboratory rats therefore run (forage) more in response to food shortages. The effect of semi-starvation on activity has also been studied in primates. Rhesus macaque males become hyperactive in response to long-term chronic food restriction.

Thin sow syndrome

Thin Sow Syndrome (TSS) is a behavior observed in stalled sows that is similar to AA where some sows after early pregnancy are extremely active, eat little, and waste away, resulting very often in death. They suffer from emaciation, hypothermia, a depraved appetite, restlessness, and hyperactivity. The syndrome may mainly be related to social and environmental stressors. Stress in stalled sows is often perceived as the consequence of the restraint of animals that happens in intensive production units. The sows that suffer the most restraining conditions are those lactating or pregnant as they have very little room to move around because they are kept in barred gestation crates or tethered for the 16 weeks of pregnancy which prevents natural and social behaviors. However, increased movement and freedom is also stressful for adult sows, which is usually the case after weaning. When placed into groups they fight vigorously, with one dominant sow emerging that eats voraciously. It is also likely that two subordinate sows make up part of the group who actively avoid competitive feeding situations and are bullied by the dominant sow. Affected sows have poor appetite but often show pica, excessive water intake (polydipsia) and are anemic.

Studies on the effects of overcrowding were conducted in the 1940s by placing pregnant Norway rats in a room with plenty of water and food and observing the population growth. The population reached a number of individuals and did not grow thereafter; overcrowding produced stress and psychopathologies. Even though there was plenty of water and food, the rats stopped eating and reproducing.

Similar effects have also been observed in dense populations of beetles. When overcrowding occurs, female beetles destroy their eggs and turn cannibalistic, eating each other. Male beetles lose interest in the females and although there is plenty of water and food, there is no population growth. Similar effects have been observed in overcrowded situations in jack rabbits and deer.

Pica

Pica is the ingestion of non-nutritive substances and has so far been poorly documented. In non-human animals in the laboratory it has been examined through the ingestion of kaolin (a clay mineral) by rats. Rats were induced to intake kaolin by administering various emetic stimuli such as copper sulfate, apomorphine, cisplatin, and motion. Rats are unable to vomit when they ingest a substance that is harmful thus pica in rats is analogous to vomiting in other species; it is a way for rats to relieve digestive distress. In some animals pica seems to be an adaptive trait but in others it seems to be a true psychopathology like in the case of some chickens. Chickens can display a type of pica when they are feed-deprived (feeding restriction has been adopted by the egg industry to induce molting). They increase their non-nutritive pecking, such as pecking structural features of their environment like wood or wire on fences or the feathers of other birds. It is a typical response that occurs when feeding is restricted or is completely withdrawn. Some of the non-nutritive pecking may be due to a redirection of foraging related behavior. Another animal that has displayed a more complex pica example are cattle. Cattle eat bones when they have a phosphorus deficiency. However, in some cases they persist on eating bones even after their phosphorus levels have stabilized and they are getting adequate doses of phosphorus in their diet. In this case evidence supports both a physical and psychological adaptive response. Cattle that continue to eat bones after their phosphorus levels are adequate do it because of a psychological reinforcer. "The persistence of pica in the seeming absence of a physiological cause might be due to the fortuitous acquisition of a conditioned illness during the period of physiological insult."

Cats also display pica behavior in their natural environments and there is evidence to support that this behavior has a psychological aspect to it. Some breeds (such as the Siamese cat) are more predisposed to showing this type of behavior than other breeds, but several types of breeds have been documented to show pica. Cats have been observed to start by chewing and sucking on non-nutritive substances like wool, cotton, rubber, plastic and even cardboard and then progress into ingestion of these substances. This type of behavior occurs through the first four years of a cat's life but it is primarily observed during the first two months of life when cats are introduced into new homes is most common. Theories explaining why this behavior becomes active during this time suggest that early weaning and stress as a consequence of separation from the mother and litter-mates and exposure to a new environment are to blame. Eating wool or other substances may be a soothing mechanism that cats develops to cope with the changes. Pica is also observed predominately during 6–8 months of a cat's life when territorial and sexual behaviors emerge. Pica may be induced by these social stressors. Other theories contemplated include pica as a redirection of prey-catching/ingestion behavior as a result of indoor confinement, especially common among oriental breeds due to risk of theft. In natural environments pica has been observed in parrots (such as macaws) and other birds and mammals. Charles Munn has been studying Amazon macaws lick clay from riverbeds in the Amazon to detoxify the seeds they eat. Amazon macaws spend two to three hours a day licking clay. Munn has found that clay helps counter the tannin and alkaloid in the seeds the macaws ingest, a strategy that is also used by native cultures in the Andes Mountains in Peru

Pica also affects domesticated animals. While drugs like Prozac are often able to diminish troublesome behaviors in pet dogs, they don't seem to help with this eating disorder. The following story about Bumbley, a wire fox terrier who appeared on 20/20 as a result of his eating disorder, is taken from a book by Dr. Nicholas Dodman.
"This dog's presenting problem was light chasing (otherwise known as shadow chasing). It chased shadows for hours on end, even excavating through plasterboard walls to pursue its will-o'-the-wisp illusions...The one thing that didn't come across clearly in the show was that Bumbley ate everything in sight and the house had to be "Bumbley-proofed" against his relentless ingestion of anything his owners left around...He had already had surgery to relieve intestinal obstructions resulting from his habit and, each day, his owners reentered their house with trepidation after work, fearing that Bumbley might have eaten something else."
Dodman talks about new research relating bulimia and compulsive overeating to seizural behavior in human patients. He suggests that anti-epileptic medication might be a possible treatment for some cases of pica in animals.

Behavioral disorders

Behavioral disorders are difficult to study in animal models because it is difficult to know what animals are thinking and because animal models used to assess psychopathologies are experimental preparations developed to study a condition. Can a monkey effectively communicate that he is sad or that he feels overwhelmed? Lacking the ability to use language to study behavioral disorders like depression and stress questions the validity of those studies conducted. It can be difficult to attribute human afflictions to non-human animals.

Obsessive compulsive disorder (OCD)

Obsessive compulsive behavior in animals, often called "stereotypy" or "stereotypical behavior" can be defined as a specific, unnecessary action (or series of actions) repeated more often than would normally be expected. It is unknown whether animals are able to 'obsess' in the same way as humans, and because the motivation for compulsive acts in non-human animals is unknown, the term "abnormal repetitive behaviour" is less misleading. 

A wide variety of animals exhibit behaviors that can be considered abnormally repetitive.

Ritualized and stereotyped behaviors

Though obsessive-compulsive behaviors are often considered to be pathological or maladaptive, some ritualized and stereotyped behaviors are beneficial. These are usually known as fixed action patterns. These behaviors sometimes share characteristics with obsessive-compulsive behavior, including a high degree of similarity in form and use among many individuals and a repetitive dimension. 

There are many observable animal behaviors with characteristic, highly conserved patterns. One example is grooming behavior in rats. This behavior is defined by a specific sequence of actions that does not normally differ between individual rats. The rat first begins by stroking its whiskers, then expands the stroking motion to include the eyes and the ears, finally moving on to lick both sides of its body. Other behaviors may be added to the end of this chain, but these four actions themselves are fixed. Its ubiquity and high degree of stereotypy suggest that this is a beneficial behavior pattern which has been maintained throughout evolutionary history. 

Pathological stereotyped behaviors also exist in animals, but they do not necessarily provide a similar model to OCD in humans. Feather picking in orange-winged amazon parrots has both a genetic component, with the behavior being more likely in one sibling if the other does it, and more common in parrots close to a door when they were housed in groups. The same study found that feather picking was more common in females and that there was no social transmission of the behavior; neighbors of feather picking birds were only more likely to show the behavior as well if they were related.

An evolutionary basis

Some researchers believe that disadvantageous obsessive compulsive behaviors can be thought of as a normally beneficial process gone too far. Brüne (2006) suggests that change of various origin in striatal and frontal brain circuits, which play a role in predicting needs and threats that may arise in the future, may result in a hyperactive cognitive harm avoidance system, in which a person becomes consciously and unreasonably fearful of an unlikely or impossible event. This may also be true in other animals.

Genetic factors

Canine compulsions are more common in some breeds and behavioral dispositions are often shared within the same litter. This suggests that there is a genetic factor to the disorder. A questionnaire to dog owners and a blood sample of 181 dogs from four breeds, miniature and standard bull terriers, German shepherds, and Staffordshire bull terriers showed these to be more susceptible to compulsive and repetitive behaviors. It is suggested that the more we learn through studying OCD in dogs, the more we can to understand human biology and the genetics involved in the heredity of susceptibility to disorders such as OCD. A chromosome has been located in dogs that confers a high risk of susceptibility to OCD. Canine chromosome 7 has been found to be most significantly associated with obsessive compulsive disorder in dogs, or more specifically, canine compulsive disorder (CCD). This breakthrough helped further relate OCD in humans to CCD in canines. Canine chromosome 7 is expressed in the hippocampus of the brain, the same area that Obsessive Compulsive Disorder is expressed in human patients. Similar pathways are involved in drug treatment responses for both humans and dogs, offering more research that the two creatures exhibit symptoms and respond to treatment in similar ways. This data can help scientists to discover more effective and efficient ways to treat OCD in humans through the information they find by studying CCD in dogs.

Animal models

Animals exhibiting obsessive and compulsive behaviors that resemble OCD in humans have been used as a tool for elucidating possible genetic influences on the disease, potential treatments, and to better understand the pathology of this behavior in general. While such models are useful, they are also limited; it is unclear whether the behavior is ego dystonic in animals. That is, it is difficult to evaluate whether an animal is aware that its behavior is excessive and unreasonable and whether this awareness is a source of anxiety. 

One study done by Simon Vermeier used neuroimaging to investigate serotonergic and dopaminergic neurotransmission in 9 dogs with Canine Compulsive Disorder (CCD) to measure the serotonin 2A receptor availability. When compared to the 15 non-compulsive dogs used as a control group, the dogs with CCD were found to have lower receptor availability as well as lower subcortical perfusion and hypothalamic availability. The results of this study provide evidence that there are imbalanced serotonergic and dopaminergic pathways in dogs. Similarities between other studies about human OCD provide construct validity for this study, which suggests that the research will be valid and useful in continuing to investigate brain activity and drug treatment in Obsessive Compulsive Disorder.

Some treatment has been given to dogs with CCD to observe their reactions and how they are similar or different from how humans would react to the same pharmaceutical or behavioral treatment. A combination of the two approaches has been found to be most effective in lowering the intensity and regularity of OCD in both canines and humans. Pharmaceutically, clomipramine was found to be more effective than an alternative chemical, amitriptyline, in treatments for dogs. One study by Karen Overall discovered that by combining behavioral therapy with the more effective clomipramine, the symptoms of Canine Compulsive Disorder decreased by over 50% for all of the dogs involved in the study. Overall acknowledges that OCD is not something that can be completely cured, but studies like this are still important because Obsessive Compulsive Disorder can be controlled effectively enough so it does not interfere with one's life, a valuable and commonly sought after thing for those who suffer from the disorder. 

Alicia Graef's article makes several bold claims that dogs are the future in understanding how to better diagnose, recognize, and treat Obsessive Compulsive Disorder in humans. There is evidence supporting her statements, but the connection between CCD and OCD is not clearly understood. So far, studies have proved that effective treatments in dogs are similarly effective for humans, but there are still so many things unknown. Obsessive Compulsive Disorder is a unique mental disorder that cannot be fully cured. It can be controlled and understood, and one possible way of better doing that might be through studying CCD in canines. Studying dogs that exhibit compulsive behaviors has led scientists to genetic breakthroughs in understanding more how biology and genetics factor into Obsessive Compulsive Disorder. By observing and studying how CCD manifests in the brain activity, behaviors, and genes of diagnosed canines, scientists have been able to use their newfound information to develop better diagnostic tests and more readily recognize symptoms and susceptible humans. The similar brain functions and behaviors of dogs with CCD and humans with OCD suggests they have a connection, not only in behavior and symptoms, but in reacting to treatments. Understanding Canine Compulsive Disorder in dogs has helped scientists to better understand and apply their learning to developing new and more effective ways to treat Obsessive Compulsive Disorder in humans. 

Some examples of ways in which rats and mice, two of the most common animal models, have been used to represent human OCD are provided below.

Lever pressing in rats

Certain laboratory rat strains that have been created by controlled breeding for many generations show a higher tendency towards compulsive behaviors than other strains. Lewis rats show more compulsive lever pressing behavior than Sprague Dawley or Wistar rats and are less responsive to the anti-compulsive drug paroxetine. In this study, rats were taught to press a lever to receive food in an operant conditioning task. Once food was no longer provided when they pressed the lever, rats were expected to stop pressing it. Lewis rats pressed the lever more often than the other two types, even though they had presumably learned that they would not receive food, and continued to press it more often even after treatment with the drug. An analysis of the genetic differences between the three rat strains might help to identify genes that might be responsible for the compulsive behavior. 

Rats have also been used to test the possibility of a problem with dopamine levels in the brains of animals that exhibit compulsive checking behavior. After treating rats with quinpirole, a chemical that specifically blocks dopamine D2/D3 receptors, compulsive checking of certain locations in an open field increased. Some components of the checking behavior, such as the level of stereotypy in the path animals took to checked locations, the number of checks, and the length of the checks indicated an increase in compulsivity as doses of quinpirole increased; other components, such as the time taken to return from the checked location to the starting point and the time taken to make that trip remained constant after the initial injection throughout the experiment. This means that there might be both an all-or-none and a sensitization aspect in the biology of the dopamine deficiency model of OCD. In addition, quinpirole might reduce a sense of satisfaction in the rats after they check a location, causing them to return to that location again and again. 

Estrogen deficiency in male mice

Based on findings of changes in OCD symptoms in menstruating women and differences in the development of the disease between men and women, Hill and colleagues set out to research the effect of estrogen deprivation on the development of compulsive behavior in mice. Male mice with an aromatase Gene knockout who were unable to produce estrogen showed excessive grooming and wheel running behaviors, but female mice did not. When treated with 17β-estradiol, which replaced estrogen in these mice, the behaviors disappeared. This study also found that COMT protein levels decreased in mice that did not produce estrogen and increased in the hypothalamus after estrogen-replacement treatment. Briefly, the COMT protein is involved in degrading some neurotransmitters, including dopamine, norepinephrine and epinephrine. This data suggests that there may be a hormonal component and a hormone-gene interaction effect that may contribute to obsessive behaviors. 

Pets 

Lick granuloma from excessive licking
 
Dr. Nicholas Dodman describes a wide variety of OCD-like behaviors in his book Dogs Behaving Badly. Such behaviors typically appear when the dog is placed in a stressful situation, including an environment that is not very stimulating, or in dogs with a history of abuse. Different breeds of dog seem to display different compulsions. Lick granuloma, or licking repeatedly until ulcers form on the skin, affects more large dogs, like Labradors, golden retrievers, Great Danes, and Dobermans, while bull terriers, German shepherds, Old English sheepdogs, Rottweilers, wire-haired fox terriers, and springer spaniels are more likely to snap at imaginary flies or chase light and shadows. These associations probably have an evolutionary basis, although Dodman does not clearly explain that aspect of the behaviors. 

Louis Shuster and Nicholas Dodman noticed that dogs often demonstrate obsessive and compulsive behaviors similar to humans. Canine Compulsive Disorder (CCD) is not only specific to certain breeds of dogs, but the breed may affect the specific types of compulsions. For example, bull terriers frequently exhibit obsessively predatory or aggressive behaviors. Breed may factor into the types of compulsions, but some behaviors are more common across the canine spectrum. Most commonly, CCD is seen in canines as they repeat behaviors such as chasing their tails, compulsively chewing on objects, or licking their paws excessively, similar to the common hand-washing compulsion many people with Obsessive Compulsive Disorder have. Hallucinating and attacking the air around their head, as if there were a bug there, is another compulsion that has been seen in some dogs. Circling, hair biting, staring, and sometimes even barking are other examples of behaviors that are considered compulsions in dogs when taken to extreme, repetitive actions.

Treatment (pharmaceutical)

Dodman advocates the use of exercise, an enriched environment (like providing noises for dogs to listen to while owners are at work), and often Prozac (an SSRI used to treat OCD in humans) as treatments. 

Shuster and Dodman tested pharmaceutical treatment on canines with CCD to see if it would work as effectively as it does in humans. They used glutamate receptor blockers (memantine) and fluoxetine, commonly known as the antidepressant Prozac, to treat and observe the reactions of 11 dogs with compulsions. Seven of the 11 dogs significantly reduced their compulsions in intensity and frequency after receiving medication.

Dodman includes a story about Hogan, a castrated deaf male Dalmatian, and his compulsive behavior. Hogan had a history of neglect and abuse before he was adopted by Connie and Jim, who attempted to improve his behavior by teaching him to respond to American Sign Language. The following are some excerpts from Hogan's file.
"All was well for a year and a half when suddenly, one March morning, he woke up and started pawing everything in sight, and just wouldn't stop. He pawed rugs and blankets, hardwood floors and linoleum, grass and dirt surfaces … The similarity between what he was doing and prey-seeking behavior was remarkable."
"I do believe … that Hogan was under some kind of psychological pressure at the time the compulsive pawing behavior developed. … Connie and Jim were compelled to leave him for some eight hours a day while they went to work. … The pendulum was set and ready to swing. The actual compulsion that develops under such circumstances is less relevant than the fact that one 'does' develop."
"The "three R's" of rehabilitation are exercise, nutrition, and communication. First, I advised Connie to step up Hogan's exercise to a minimum of thirty minutes of aerobic activity a day. In addition, I advised that Hogan should be fed a low-protein, preservative-free diet. Completing the rehabilitation checklist, I exhorted Connie to work even harder with the sign-language and instructed her on a new sign to use when Hogan started digging. The sign was a piece of card with the letter 'H' written on it in thick black pen. Connie was to show Hogan this sign as soon as possible after he engaged in a bout of unwanted pawing and then leave the room. The idea was to let him know that the behavior was not wanted by signaling to him that Connie was about to leave the room. … Call me a coward, but I didn't think that alone would cut it because of previous experiences with canine compulsive disorders so, employing a belt-and-suspenders strategy, I also advised medicating Hogan with the tricyclic antidepressant Elavil. Theoretically, Elavil wouldn't be that good in obsessive-compulsive behavior but, limited for reasons of expense, and bearing in mind the possible contribution of separation anxiety, Elavil was my best shot."
"It took six months before Hogan was over the hump of treatment success. … At this time Hogan only engaged in occasional pawing of significantly reduced intensity, and the pawing only occurred in moments of stress. Connie reported that stresses particularly likely to induce pawing included being unable to find her and sensing that he was about to be left alone. … Hogan continued to improve and reached a point at which he was almost pawing-free - but not quite. That seems to be the way with compulsive disorders in man and beast. They can be reduced to the level of permitting affectees to lead relatively normal lives, but there are occasional relapses."

Addiction

Sugar addiction has been examined in laboratory rats and it develops in the same way that drug addiction develops. Eating sugary foods causes the brain to release natural chemicals called opioids and dopamine in the limbic system. Tasty food can activate opioid receptors in the ventral tegmental area and thereby stimulate cells that release dopamine in the nucleus accumbens (NAc). The brain recognizes the intense pleasure derived from the dopamine and opioids release and learns to crave more sugar. Dependence is created through these natural rewards, the sugary treats, and the opioid and dopamine released into the synapses of the mesolimbic system. The hippocampus, the insula and the caudate activate when rats crave sugar, which are the same areas that become active when drug addicts crave the drug. Sugar is good because it provides energy, but if the nervous system goes through a change and the body becomes dependent on the sugar intake, somatic signs of withdrawal begin to appear like chattering teeth, forepaw tremors and head shakes when sugar is not ingested. Morphine tolerance, a measure of addiction, was observed in rats and their tolerance on Morphine was attributed to environmental cues and the systemic effects of the drug. Morphine tolerance does not depend merely on the frequency of pharmacological stimulation, but rather on both the number of pairings of a drug-predictive cue with the systemic effects of the drug. Rats became significantly more tolerant to morphine when they had been exposed to a paired administration than those rats that were not administered a drug-predictive cue along with the morphine.

Depression

Using dogs, Martin Seligman and his colleagues pioneered the study of depression in the animal model of learned helplessness at the University of Pennsylvania. Dogs were separated into three groups, the control group, group A had control over when they were being shocked and group B had no control over when they were being electrocuted. After the shocking condition, the dogs were tested in a shuttle box where they could escape shock by jumping over a partition. To eliminate an interference effect – that the dogs did not learn responses while being shocked that would interfere with their normal escape behavior – the dogs were immobilized using curare, a paralyzing drug while they were being shocked. Both the control group and group A tended to jump over the partition to escape shock while group B dogs did not jump and would passively take the shock. The dogs in group B perceived that the outcome was not related to their efforts. Consequently, a theory emerged that attributed the behavior of the animals to the effects of the shock as a stressor so extreme that it depleted a neurochemical needed by the animals for movement. After the dogs study the effects of helplessness have been tested in species from fish to cats. Most recently learned helplessness has been studied in rhesus macaques using inescapable shock, evoked through stress situations like forced swimming, behavioral despair tasks, tails suspension and pinch induced catalepsy; situations that render the monkey incapable of controlling the environment.

Depression and low mood were found to be of a communicative nature. They signal yielding in a hierarchy conflict or a need for help. Low mood or extreme low mood (also known as depression) can regulate a pattern of engagement and foster disengagement from unattainable goals. "Low mood increases an organism's ability to cope with the adaptive challenges characteristic of unpropitious situations in which effort to pursue a major goal will likely result in danger, loss, bodily damage, or wasted effort." Being apathetic can have a fitness advantage for the organism. Depression has also been studied as a behavioral strategy used by vertebrates to increase their personal or inclusive fitness in the threat of parasites and pathogens.

The lack of neurogenesis has been linked to depression. Animals with stress (isolated, cortisol levels) show a decrease in neurogenesis and antidepressants have been discovered to promote neurogenesis. Rene Hen and his colleagues at Columbia University ran a study on rats in which they blocked neurogenesis by applying radiation to the hippocampal area to test the efficacy of antidepressants. Results suggested that antidepressants failed to work when neurogenesis was inhibited.

Stress

Robert Sapolsky has extensively studied baboons in their natural environment in the Serengeti in Africa. He noticed that baboons have very similar hierarchies in their society as do humans. They spend very few hours searching for food and fulfilling their primary needs, leaving them with time to develop their social network. In primates, mental stresses show up in the body. Primates experience psychological stresses that can elicit physiological responses that, over time, can make them sick. Sapolsky observed the baboons' ranks, personalities and social affiliations, then collected blood samples of the baboons to control the cortisol (stress hormone) levels of the baboons, then matched social position to cortisol levels. Most of the data have been collected from male baboons, because at any given time 80 percent of the females were pregnant. Three factors influenced a baboon's cortisol levels: friendships, perspective, and rank. Baboons had lower levels of cortisol if they 1. played with infants and cultivated friendships, 2. could tell if a situation was a real threat and could tell if they were going to win or lose, and 3. were top ranking. 

Cortisol levels rise with age and hippocampal cells express fewer hormone receptors on their surface to protect themselves from excess, making it harder to control stress levels. Cortisol levels are elevated in half of people suffering from major depression, it is the hippocampal region that is affected by both. Stress can have negative effects on gastrointestinal function causing ulcers, and it can also decrease sex drive, affect sleeping patterns and elevate blood pressure but it can also stimulate and motivate. When animals experience stress, they are generally more alert than when they are not stressed. It may help them be better aware of unfamiliar environments and possible threats to their life in these environments. Yerkes and Dodson developed a law that explains the empirical relationship between arousal and performance illustrated by an inverted U-shape graph. According to the Yerkes-Dodson Law, performance increases, as does cognitive arousal, but only to a certain point. The downward part of the U-shape is caused by stress and as stress increases so does efficiency and performance, but only to a certain point. When stress becomes too great, performance and efficiency decline. 

Sapolsky has also studied stress in rats and his results indicate that early experiences in young rats have strong, lasting effects. Rats that were exposed to human handling (a stressful situation) had finely-tuned stress responses that may have lowered their lifetime exposure to stress hormones compared to those that were not handled. In short: stress can be adaptive. The more exposure to stressful situations, the better the rat can handle that situation.

Stereotypies

Stereotypies are repetitive, sometimes abnormal behaviors like pacing on the perch for birds. There are adaptive stereotypic behaviors such as grooming in cats and preening in birds. Captive parrots commonly perform a range of stereotypies. These behaviors are repeated identically and lack any function or goal. Captive parrots perform striking oral and locomotor stereotypies like pacing on the perch or repetitive play with a certain toy. Feather picking and loud vocalizations can be stereotypies but are not as rigid and may be reactions to confinement, stress, boredom and loneliness as studies have shown that parrots that are in cages closest to the door are the most prone to feather pick or scream. Feather picking is not a true stereotypy and is more like hair pulling in human and loud vocalizations or screaming can be a stereotypy but vocalization is part of a parrot's natural behavior. Captive parrots lack sufficient stimulation. Presumably they suffer from lack of companionship and opportunities to forage. Stereotypies can evolve from the social environment for example the presence or absence of certain social stimuli, social isolation, low feeder space and high stocking density (especially for tail biting in pigs). These behaviors can also be transmitted through social learning. Bank voles, pigeons and pigs when housed next to animals that show stereotypies, pick them up as well as through stimulus enhancement which is what happens in tail biting in pigs and feather pecking by hens.

Stereotypies may be coping mechanisms as results suggest from study on tethered and stalled sows. Sows that are tethered and stalled exhibited more stereotypies like licking and rubbing than sows that are in groups outdoors. This abnormal behavior seems to be related to opioid (related to the reward system) receptor density. In sows, prolonged confinement, being tethered or being in gestation crates, results in abnormal behaviors and stereotypies. Mu and Kappa receptors are associated with aversion behaviors and Mu receptor density is greater in tethered sows than sows that are in groups outdoors. However, sows with stereotypy behaviors experienced a decrease both in Mu and Kappa receptor density in the brain suggesting that inactivity increases Mu receptor density and stereotypy development decrease both kappa and Mu receptor density.

Self-aggression

Rhesus macaques have been observed to display self-aggression (SA) including self-biting, self-clasping, self-slapping, self-rubbing and threatening of body parts. The rhesus macaques observed were individually caged and free of disease. Their self-aggression level rose in stressful and stimulating conditions such as moving from one cage to another. Stump-tailed macaques were studied to examine the source of their SA. SA increased in an impoverished environment and results support that SA may increase sensory input in poor environments. Captive macaques do not socialize the way wild macaques do which may affect SA. When allowed to socialize by putting another macaque in the cage or not putting them in a cage, SA levels in macaques decrease. Results indicate that SA is a form of redirected social aggression. SA is related to frustration and social status, especially in macaques that have an intermediate dominance rank.

Synthetic data

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