From Wikipedia, the free encyclopedia
Applied behavior analysis (ABA), also called behavioral engineering, is a psychological intervention that applies empirical approaches based upon the principles of respondent and operant conditioning to change behavior of social significance. It is the applied form of behavior analysis; the other two forms are radical behaviorism (or the philosophy of the science) and the experimental analysis of behavior (or basic experimental laboratory research).
The name applied behavior analysis has replaced behavior modification
because the latter approach suggested attempting to change behavior
without clarifying the relevant behavior-environment interactions. In
contrast, ABA changes behavior by first assessing the functional relationship between a targeted behavior and the environment. Further, the approach often seeks to develop socially acceptable alternatives for aberrant behaviors.
Although service delivery providers overwhelmingly specialize in utilizing structured and naturalistic early behavioral interventions for individuals with autism, ABA has also been utilized in a range of other areas.
ABA is controversial, especially among members of the autism rights movement, for a number of reasons. There is a perception that some ABA interventions emphasize normalization, instead of acceptance, and a history of, in some embodiments of ABA and its predecessors, the use of aversives, such as electric shocks. ABA is also controversial due to concerns about its relatively weak evidence base.
In the last few years, there have been reforms in some types of ABA
interventions to address these criticisms and concerns, especially
regarding masking.
Definition
ABA is an applied science devoted to developing procedures which will produce observable changes in behavior. It is to be distinguished from the experimental analysis of behavior, which focuses on basic experimental laboratory research, but it uses principles developed by such research, in particular operant conditioning and classical conditioning. Behavior analysis adopts the viewpoint of radical behaviorism,
treating thoughts, emotions, and other covert activity as behavior that
is subject to the same rules as overt responses. This represents a
shift away from methodological behaviorism, which restricts behavior-change procedures to behaviors that are overt, and was the conceptual underpinning of behavior modification.
Behavior analysts also emphasize that the science of behavior must be a natural science as opposed to a social science. As such, behavior analysts focus on the observable relationship of behavior with the environment, including antecedents and consequences, without resort to "hypothetical constructs".
History
Further information:
Radical behaviorism,
Experimental analysis of behavior,
Behavior modification,
Operant conditioning,
B. F. Skinner,
Charles Ferster,
Nathan Azrin,
Jack Michael,
Donald M. Baer,
Montrose Wolf,
Sidney W. Bijou,
Ivar Lovaas,
Robert Koegel, and
Steven C. Hayes
The beginnings of ABA can be traced back to Teodoro Ayllon and Jack Michael's study "The psychiatric nurse as a behavioral engineer" (1959) that they published in the Journal of the Experimental Analysis of Behavior (JEAB). Ayllon and Michael were training the staff at a psychiatric hospital how to use a token economy based on the principles of operant conditioning for patients with schizophrenia and intellectual disability, which led to researchers at the University of Kansas to start the Journal of Applied Behavior Analysis (JABA) in 1968.
A group of researchers at the University of Washington, including Donald Baer, Sidney W. Bijou, Bill Hopkins, Jay Birnbrauer, Todd Risley, and Montrose Wolf,
applied the principles of behavior analysis to manage the behavior of
children and adolescents in juvenile detention centers and organize employees who required proper structure and management in businesses.
In 1968, Baer, Bijou, Risley, Birnbrauer, Wolf, and James Sherman
joined the Department of Human Development and Family Life at the University of Kansas, where they founded the Journal of Applied Behavior Analysis.
Notable graduate students from the University of Washington include Robert Wahler, James Sherman, and Ivar Lovaas. Lovaas established the UCLA Young Autism Project while teaching at the University of California, Los Angeles.
In 1965, Lovaas published a series of articles that described a
pioneering investigation of the antecedents and consequences that
maintained a problem behavior, and relied on the methods of errorless learning which was initially used by Charles Ferster
to teach nonverbal children to speak. Lovaas also described how to use
social (secondary) reinforcers, teach children to imitate, and what
interventions (including electric shocks) may be used to reduce
aggression and life-threatening self-injury.
In 1987, Lovaas published the study, "Behavioral treatment and
normal educational and intellectual functioning in young autistic
children".
The experimental group in this study received an average of 40 hours
per week in a 1:1 teaching setting at a table using errorless discrete trial training (DTT).
The treatment is done at home with parents involved, and the curriculum
is highly individualized with a heavy emphasis on teaching eye contact,
fine and gross motor imitation, and language. The use of aversives and
reinforcement were used to motivate learning and reduce non-desired
behaviors. Early development of the therapy in the 1960s involved use of shocks and the withholding of food.
By the time children were enrolled in this study, such aversives were
abandoned, and a loud "no" or a slap to the thigh were used only as a
last resort to reduce aggressive and self-stimulatory behaviors. The
outcome of this study indicated 47% of the experimental group (9/19)
went on to lose their autism diagnosis and were described as
indistinguishable from their typical adolescent peers. This included
passing education without assistance and making and maintaining friends.
These gains were maintained as reported in the 1993 study, "Long-term
outcome for children with autism who received early intensive behavioral
treatment". Lovaas' work went on to be recognized by the US Surgeon
General in 1999, and his research were replicated in university and
private settings. The "Lovaas Method" went on to become known as early intensive behavioral intervention (EIBI).
Over the years, "behavior analysis" gradually superseded
"behavior modification"; that is, from simply trying to alter
problematic behavior, behavior analysts sought to understand the
function of that behavior, what reinforcement histories (i.e., attention
seeking, escape, sensory stimulation, etc.) promote and maintain it,
and how it can be replaced by successful behavior.
This analysis is based on careful initial assessment of a behavior's
function and a testing of methods that produce changes in behavior.
While ABA seems to be intrinsically linked to autism
intervention, it is also used in a broad range of other situations.
Recent notable areas of research in the Journal of Applied Behavior
Analysis include autism, classroom instruction with typically developing students, pediatric feeding therapy, and substance use disorders. Other applications of ABA include applied animal behavior, consumer behavior analysis, forensic behavior analysis, behavioral medicine, behavioral neuroscience, clinical behavior analysis, organizational behavior management, schoolwide positive behavior support, and contact desensitization for phobias.
Characteristics
Baer, Wolf, and Risley's 1968 article is still used as the standard description of ABA. It lists the following seven characteristics of ABA. Another great
resource for the characteristics of applied behavior analysis is from a
textbook called, “Behavior Modification: Principles and Procedures.”
- Applied: ABA focuses on the social significance of the
behavior studied. For example, a non-applied researcher may study eating
behavior because this research helps to clarify metabolic processes,
whereas the applied researcher may study eating behavior in individuals
who eat too little or too much, trying to change such behavior so that
it is more acceptable to the persons involved. It is also based on
trying to improve the everyday life of clients that are receiving it.
- Behavioral: ABA is pragmatic; it asks how it is possible to
get an individual to do something effectively. To answer this question,
the behavior itself must be objectively measurable and observable. This
is designed so that when someone is trying to determine a target
behavior, it is able to be observed and understood by anyone. Verbal
descriptions are treated as behavior in themselves, and not as
substitutes for the behavior described.
- Analytic: Behavior analysis is successful when the analyst
understands and can manipulate the events that control a target
behavior. This may be relatively easy to do in the lab, where a
researcher is able to arrange the relevant events, but it is not always
easy, or ethical, in an applied situation.
In order to consider something to fall under the spectrum of analytic,
it must demonstrate a functional relationship and it must be provable.
Baer et al. outline two methods that may be used in applied settings to
demonstrate control while maintaining ethical standards. These are the
reversal design and the multiple baseline design. In the reversal
design, the experimenter first measures the behavior of choice,
introduces an intervention, and then measures the behavior again. Then,
the intervention is removed, or reduced, and the behavior is measured
yet again. The intervention is effective to the extent that the behavior
changes and then changes back in response to these manipulations. The
multiple baseline method may be used for behaviors that seem
irreversible. Here, several behaviors are measured and then the
intervention is applied to each in turn. The effectiveness of the
intervention is revealed by changes in just the behavior to which the
intervention is being applied.
- Technological: The description of analytic research must be clear and detailed, so that any competent researcher can repeat it accurately.
The goal is to make sure that anyone can implement and understand what
is being explained. Cooper et al. describe a good way to check this:
Have a person trained in applied behavior analysis read the description
and then act out the procedure in detail. If the person makes any
mistakes or has to ask any questions then the description needs
improvement.
- Conceptually Systematic: Behavior analysis should not simply
produce a list of effective interventions. Rather, to the extent
possible, these methods should be grounded in the principles of applied
behavioral analysis. This is aided by the use of theoretically
meaningful terms, such as "secondary reinforcement" or "errorless
discrimination" where appropriate.
- Effective: Though analytic methods should be theoretically
grounded, they must be effective. Interventions also must be relevant to
the client and/or culture. An analyst must ask themselves if the
intervention is working. The intervention must also contain a positive
change. If an intervention does not produce a large enough effect for
practical use, then the analysis has failed
- Generality: Behavior analysts should aim for interventions
that are generally applicable; the methods should work in different
environments, apply to more than one specific behavior, and have
long-lasting effects. This generalizability should be implemented from
the very beginning of the intervention. When first starting a new
intervention, it is a good idea for that to take place in a natural
environment for the client.
Other proposed characteristics
In 2005, Heward et al. suggested that the following five characteristics should be added:
- Accountable: To be accountable means that ABA must be
able to demonstrate that its methods are effective. This requires the
repeatedly measuring the effect of interventions (success, failure or no
effect at all), and, if necessary, making changes that improve their
effectiveness.
- Public: The methods, results, and theoretical analyses of ABA
must be published and open to scrutiny. There are no hidden treatments
or mystical, metaphysical explanations.
- Doable: To be generally useful, interventions should be
available to a variety of individuals, who might be teachers, parents,
therapists, or even those who wish to modify their own behavior. With
proper planning and training, many interventions can be applied by
almost anyone willing to invest the effort.
- Empowering: ABA provides tools that give the practitioner
feedback on the results of interventions. These allow clinicians to
assess their skill level and build confidence in their effectiveness.
- Optimistic: According to several leading authors, behavior analysts have cause to be optimistic that their efforts are socially worthwhile, for the following reasons:
- The behaviors impacted by behavior analysis are largely
determined by learning and controlled by manipulable aspects of the
environment.
- Practitioners can improve performance by direct and continuous measurements.
- As a practitioner uses behavioral techniques with positive outcomes, they become more confident of future success.
- The literature provides many examples of success in teaching individuals considered previously unteachable.
Use in the treatment of autism
A large majority of ABA practitioners specialise in autism, although BCBA certification does not require any autism training. ABA-based techniques are often used to teach adaptive behaviors or to diminish behaviors associated with autism, so much that ABA itself is often mistakenly considered to be synonymous with therapy for autism. According to a paper from 2007, it was considered to be an effective "intervention for challenging behaviors" by the American Academy of Pediatrics. A 2018 Cochrane
review of five studies that compared treatment vs. control showed that
ABA may be effective for some autistic children, but noted that the
evidence for this is weak. The effectiveness of ABA treatments for autism may be overall limited by diagnostic severity, age of intervention, and IQ.
Efficacy
2020 onward reviews
Justin B. Leaf and others examined and responded to criticisms of ABA in a 2021 paper.
The results of two studies surveying autistic adults who went
through ABA as a child found that a majority perceived ABA to have a
detrimental impact on their lives, although in common with most ABA
research, the studies had methodological concerns and a risk of bias.
Two 2020 reviews found that very few studies directly reported on or
investigated possible harms; although a significant number of studies
mentioned adverse events in their analysis of why people withdrew from
them, there was no effort to monitor or collect data on adverse
outcomes.
2010-2019 reviews
In 2011, investigators from Vanderbilt University under contract with the Agency for Healthcare Research and Quality
performed a comprehensive review of the scientific literature on
ABA-based and other therapies for autism spectrum disorders; the
ABA-based therapies included the UCLA/Lovaas method and the Early Start Denver Model (the latter developed by Sally Rogers and Geraldine Dawson).
They concluded that "both approaches were associated with ...
improvements in cognitive performance, language skills, and adaptive
behavior skills". However, they also concluded that "the strength of evidence ... is
low", "many children continue to display prominent areas of impairment",
"subgroups may account for a majority of the change", there is "little
evidence of practical effectiveness or feasibility beyond research
studies", and the published studies "used small samples, different
treatment approaches and duration, and different outcome measurements".
A preliminary 2014 study indicated that there might be a publication bias against single-subject research
studies that show that ABA is ineffective. Publication bias could lead
to exaggerated estimates of intervention effects observed by
single-subject studies.
A 2019 meta-analysis found some evidence in favour of behavioral
interventions, but noted that "methodological rigor remains a pressing
concern in this area of research" and, when they limited their scope to
RCT designs and outcomes for which there was no risk of detection bias,
found no significant effects on any outcome, for any of the approaches
they looked at.
2007-2009 reviews
A 2007 clinical report of the American Academy of Pediatrics
concluded that the benefit of ABA-based interventions in autism
spectrum disorders (ASDs) "has been well documented" and that "children
who receive early intensive behavioral treatment have been shown to make
substantial, sustained gains in IQ, language, academic performance, and
adaptive behavior as well as some measures of social behavior". In 2008, Researchers from the MIND Institute
published an evidence-based review of comprehensive treatment
approaches. On the basis of "the strength of the findings from the four
best-designed, controlled studies", they were of the opinion that one
ABA-based approach (the Lovaas technique created by Ole Ivar Løvaas) is "well-established" for improving intellectual performance of young children with ASD.
A 2009 review of psycho-educational interventions for children
with autism whose mean age was six years or less at intake found that
five high-quality ("Level 1" or "Level 2") studies assessed ABA-based
treatments. On the basis of these and other studies, the author
concluded that ABA is "well-established" and is "demonstrated effective
in enhancing global functioning in pre-school children with autism when
treatment is intensive and carried out by trained therapists".
However, the review committee also concluded that "there is a great
need for more knowledge about which interventions are most effective". A
2009 paper included a descriptive analysis, an effect size analysis,
and a meta-analysis
of 13 reports published from 1987 to 2007 of early intensive behavioral
intervention (EIBI, a form of ABA-based treatment with origins in the
Lovaas technique) for autism. It determined that EIBI's effect sizes
were "generally positive" for IQ, adaptive behavior, expressive
language, and receptive language. The paper did note limitations of its
findings including the lack of published comparisons between EIBI and
other "empirically validated treatment programs". In a 2009 systematic review
of 11 studies published from 1987 to 2007, the researchers wrote "there
is strong evidence that EIBI is effective for some, but not all,
children with autism spectrum disorders, and there is wide variability
in response to treatment". Furthermore, any improvements are likely to
be greatest in the first year of intervention.
A 2009 meta-analysis of nine studies published from 1987 to 2007
concluded that EIBI has a "large" effect on full-scale intelligence and a
"moderate" effect on adaptive behavior in autistic children.
A 2009 systematic review and meta-analysis by Spreckley and Boyd of
four small-n 2000–2007 studies (involving a total of 76 children) came
to different conclusions than the aforementioned reviews.
Spreckley and Boyd reported that applied behavior intervention (ABI),
another name for EIBI, did not significantly improve outcomes compared
with standard care of preschool children with ASD in the areas of
cognitive outcome, expressive language, receptive language, and adaptive
behavior.
In a letter to the editor, however, authors of the four studies
meta-analyzed claimed that Spreckley and Boyd had misinterpreted one
study comparing two forms of ABI with each other as a comparison of ABI
with standard care, which erroneously decreased the observed efficacy of
ABI.
Furthermore, the four studies' authors raised the possibility that
Spreckley and Boyd had excluded some other studies unnecessarily, and
that including such studies could have led to a more favorable
evaluation of ABI. Spreckley, Boyd, and the four studies' authors did agree that large multi-site randomized trials are needed to improve the understanding of ABA's efficacy in autism.
Criticism
Researchers and advocates have critiqued the leniency of the ABA ethical code,
discussing how it does not restrict or clarify the "appropriate use of
aversives", does not require competency as ABA therapists are "not
required to take even a single class on autism, brain function or child
development", and its view of the client as the parent meaning that
requiring "client consent" only requires parental consent, not the
person receiving services.
Similarly, because the parent is seen as the client, the goals that are
set under the ethical code are according to the client's needs, which
often means that focusing on changing autistic behaviors for the benefit
of the parent and not the child is considered ethical. Furthermore, studies have shown that ABA may be abusive and can increase symptoms of post-traumatic stress disorder (PTSD) in patients. The Autistic Self Advocacy Network campaigns against the use of ABA in autism.
Another criticism of the Lovaas Method is Lovaas's connection with gay conversion therapy, using his own behavior modification techniques seen in ABA in The Feminine Boy project.
Similarities in gay conversion therapy to making boys indistinguishable
from their heterosexual peers have been drawn with Lovaas' belief that
ABA makes "autistic children indistinguishable from their normal
friends." According to social worker and researcher Jake Pyne, ableism
is the reason why ABA continues to be practiced in some jurisdictions
where conversion therapy is prohibited, despite underlying similarities.
One study revealed extensive undisclosed conflicts of interest
(COI) in published ABA studies. 84% of studies published in top
behavioral journals over a period of one year had at least one author
with a COI involving their employment, either as an ABA clinical
provider or a training consultant to ABA clinical providers. However,
only 2% of these studies disclosed the COI.
Some bioethicists
argue that employing ABA violates the principles of justice and
nonmaleficence and infringes on the autonomy of autistic children, and
their parents as well.
Another concern is that ABA research only measures behavior as a
means of success, which has led to a lack of qualitative research about
autistic experiences of ABA, a lack of research examining the internal
effects of ABA and a lack of research for autistic children who are non-speaking
or have comorbid intellectual disabilities (which is concerning
considering this is one of the major populations that intensive ABA
focuses on). Research is also lacking about whether ABA is effective long-term and very little longitudinal outcomes have been studied.
One more area of critique has been the "ideological warfare" surrounding ABA and TEACCH, despite the philosophies and practices of the two approaches not necessarily being in opposition.
The rhetoric surrounding ABA was criticized by The British Institute of
Learning Disabilities, including parents and professionals that claim
that ABA "cured" their child's autism, like one parent who "claims that
ABA had saved her children's lives, likening it to chemotherapy as a treatment for cancer."
The value of eliminating autistic behaviors is disputed by proponents of neurodiversity, who claim that it forces autistic people to mask their true personalities on behalf of a narrow conception of normality. Masking is associated with suicidality and poor long-term mental health.
Autism advocates contend that it is cruel to try to make autistic
people "normal" without consideration for how this may affect their
well-being.
Instead, these critics advocate for increased social acceptance of
harmless autistic traits and therapies focused on improving quality of
life.
A 2020 study examined perspectives of autistic adults that
received ABA as children and found that the overwhelming majority
reported that "behaviorist methods create painful lived experiences",
that ABA led to the "erosion of the true actualizing self", and that
they felt they had a "lack of self-agency within interpersonal
experiences".
In response to many of the criticisms towards ABA from the autistic community, some behavior analysts have referenced Damian Milton's theory of the double empathy problem,
saying that behavior analysts are "just different" and "think
differently from most other people", consequently feeling misunderstood
and discriminated against by the autistic community.
Use of aversives
Some embodiments of applied behavior analysis as devised by Ole Ivar Lovaas used aversives
such as electric shocks to modify undesirable behavior in their initial
use in the 1970s, as well as slapping and shouting in a 1987 study.
Over time the use of aversives lessened and in 2012 their use was
described as being inconsistent with contemporary practice. However, aversives have continued to be used in some ABA programs. In comments made in 2014 to the US Food and Drug Administration (FDA), a clinician who previously worked at the Judge Rotenberg Educational Center
claimed that "all textbooks used for thorough training of applied
behavior analysts include an overview of the principles of punishment,
including the use of electrical stimulation."
In 2010, the UN's Special Rapporteur on Torture described the
Judge Rotenberg Center's use of electrical shocks on children as
torture.
In 2020, the FDA banned the use of electrical stimulation devices used
for self-injurious or aggressive behavior and asserted that "Evidence
indicates a number of significant psychological and physical risks are
associated with the use of these devices, including worsening of
underlying symptoms, depression, anxiety, PTSD, pain, burns, and tissue damage."
In the same year, the U.S. Court of Appeals for the D.C. Circuit
overturned the ban, ruling that the FDA "has no authority to choose what
medical devices a practitioner should prescribe or administer or for
which conditions" and the school announced that it would resume the use
of electrical shocks.
Concepts
Behavior
Behavior refers to the movement of some part of an organism that changes some aspect of the environment. Often, the term behavior refers to a class of responses that share physical dimensions or functions, and in that case a response is a single instance of that behavior. If a group of responses have the same function, this group may be called a response class. Repertoire
refers to the various responses available to an individual; the term
may refer to responses that are relevant to a particular situation, or
it may refer to everything a person can do.
Operant conditioning
Operant behavior is the so-called "voluntary" behavior that is sensitive to, or controlled by its consequences. Specifically, operant conditioning refers to the three-term contingency that uses stimulus control,
in particular an antecedent contingency called the discriminative
stimulus (SD) that influences the strengthening or weakening of behavior
through such consequences as reinforcement or punishment.
The term is used quite generally, from reaching for a candy bar, to
turning up the heat to escape an aversive chill, to studying for an exam
to get good grades.
Respondent (classical) conditioning
Respondent (classical) conditioning is based on innate
stimulus-response relationships called reflexes. In his famous
experiments with dogs, Pavlov usually used the salivary reflex, namely
salivation (unconditioned response) following the taste of food
(unconditioned stimulus). Pairing a neutral stimulus, for example a bell
(conditioned stimulus) with food caused the dog to elicit salivation
(conditioned response). Thus, in classical conditioning, the conditioned
stimulus becomes a signal for a biologically significant consequence.
Note that in respondent conditioning, unlike operant conditioning, the
response does not produce a reinforcer or punisher (e.g., the dog does not get food because it salivates).
Reinforcement
Reinforcement is the key element in operant conditioning and in most behavior change programs.
It is the process by which behavior is strengthened. If a behavior is
followed closely in time by a stimulus and this results in an increase
in the future frequency of that behavior, then the stimulus is a
positive reinforcer. If the removal of an event serves as a reinforcer,
this is termed negative reinforcement. There are multiple schedules of reinforcement that affect the future probability of behavior. "[H]e would get Beth to comply by hugging him and giving her food as a reward"
Punishment
Punishment is a process by which a consequence immediately follows a
behavior which decreases the future frequency of that behavior. As with
reinforcement, a stimulus can be added (positive punishment) or removed (negative punishment).
Broadly, there are three types of punishment: presentation of aversive
stimuli (e.g., pain), response cost (removal of desirable stimuli as in
monetary fines), and restriction of freedom (as in a 'time out'). Punishment in practice can often result in unwanted side effects. Some other potential unwanted effects include resentment over being punished, attempts to escape the punishment, expression of pain
and negative emotions associated with it, and recognition by the
punished individual between the punishment and the person delivering it.
"He would use loud sounds of 100 decibels on two 5-year-old autistic
twins"
Extinction
Extinction is the technical term to describe the procedure of
withholding/discontinuing reinforcement of a previously reinforced
behavior, resulting in the decrease of that behavior.
The behavior is then set to be extinguished (Cooper et al.). Extinction
procedures are often preferred over punishment procedures, as many
punishment procedures are deemed unethical and in many states
prohibited. Nonetheless, extinction procedures must be implemented with
utmost care by professionals, as they are generally associated with
extinction bursts. An extinction burst is the temporary increase in the
frequency, intensity, and/or duration of the behavior targeted for
extinction.
Other characteristics of an extinction burst include an
extinction-produced aggression—the occurrence of an emotional response
to an extinction procedure often manifested as aggression; and b)
extinction-induced response variability—the occurrence of novel
behaviors that did not typically occur prior to the extinction
procedure. These novel behaviors are a core component of shaping procedures.
Discriminated operant and three-term contingency
In
addition to a relation being made between behavior and its
consequences, operant conditioning also establishes relations between
antecedent conditions and behaviors. This differs from the S–R
formulations (If-A-then-B), and replaces it with an AB-because-of-C
formulation. In other words, the relation between a behavior (B) and its
context (A) is because of consequences (C), more specifically, this
relationship between AB because of C indicates that the relationship is
established by prior consequences that have occurred in similar
contexts.
This antecedent–behavior–consequence contingency is termed the
three-term contingency. A behavior which occurs more frequently in the
presence of an antecedent condition than in its absence is called a
discriminated operant. The antecedent stimulus is called a
discriminative stimulus (SD). The fact that the discriminated operant occurs only in the presence of the discriminative stimulus is an illustration of stimulus control.
More recently behavior analysts have been focusing on conditions that
occur prior to the circumstances for the current behavior of concern
that increased the likelihood of the behavior occurring or not
occurring. These conditions have been referred to variously as "Setting
Event", "Establishing Operations", and "Motivating Operations" by
various researchers in their publications.
Verbal behavior
B. F. Skinner's classification system of behavior analysis has been applied to treatment of a host of communication disorders. Skinner's system includes:
- Tact – a verbal response evoked by a non-verbal antecedent and maintained by generalized conditioned reinforcement.
- Mand – behavior under control of motivating operations maintained by a characteristic reinforcer.
- Intraverbals – verbal behavior for which the relevant antecedent
stimulus was other verbal behavior, but which does not share the
response topography of that prior verbal stimulus (e.g., responding to
another speaker's question).
- Autoclitic
– secondary verbal behavior which alters the effect of primary verbal
behavior on the listener. Examples involve quantification, grammar, and
qualifying statements (e.g., the differential effects of "I think..."
vs. "I know...")
Skinner's use of behavioral techniques was famously critiqued by the linguist Noam Chomsky
through an extensive breakdown of how Skinner's view of language as
behavioral simply cannot explain the complexity of human language.
This suggests that while behaviorist techniques can teach language, it
is a very poor measure to explain language fundamentals. Considering
Chomsky's critiques, it may be more appropriate to teach language
through a Speech language pathologist instead of a behaviorist.
For an assessment of verbal behavior from Skinner's system, see Assessment of Basic Language and Learning Skills.
Measuring behavior
When measuring behavior, there are both dimensions of behavior and
quantifiable measures of behavior. In applied behavior analysis, the
quantifiable measures are a derivative of the dimensions. These
dimensions are repeatability, temporal extent, and temporal locus.
Repeatability
Response classes occur repeatedly throughout time—i.e., how many times the behavior occurs.
- Count is the number of occurrences in behavior.
- Rate/frequency is the number of instances of behavior per unit of time.
- Celeration is the measure of how the rate changes over time.
Temporal extent
This dimension indicates that each instance of behavior occupies some amount of time—i.e., how long the behavior occurs.
- Duration is the period of time over which the behavior occurs.
Temporal locus
Each instance of behavior occurs at a specific point in time—i.e., when the behavior occurs.
- Response latency is the measure of elapsed time between the onset of a stimulus and the initiation of the response.
- Interresponse time is the amount of time that occurs between two consecutive instances of a response class.
Derivative measures
Derivative measures are unrelated to specific dimensions:
- Percentage is the ratio formed by combining the same dimensional quantities.
- Trials-to-criterion are the number of response opportunities needed to achieve a predetermined level of performance.
Applied behavior analysis is a goal discipline and spotlights on the
dependable measurement and objective assessment of noticeable way of
behaving. Without measuring behavior and assessing the information,
behavior analysts wouldn't know whether to change the program we are
chipping away at, when to switch or add new targets or when to change
strategies to gain more noteworthy progress.
Behavior Analysts utilize a few distinct techniques to gather
information. A portion of the ways of collect data information include:
Frequency
This technique refers to the times that an objective way of behaving was noticed and counted.
Rate
Same as frequency, yet inside a predefined time limit.
Duration
This estimation alludes to how much time that somebody participated in a way of behaving.
Fluency
This estimation refers to how rapidly a student can give reactions inside a timeframe.
Response latency
Latency refers to how much time after a particular boost has been given before the objective way of behaving happens.
Analyzing behavior change
Experimental control
In applied behavior analysis, all experiments should include the following:
- At least one participant
- At least one behavior (dependent variable)
- At least one setting
- A system for measuring the behavior and ongoing visual analysis of data
- At least one treatment or intervention condition
- Manipulations of the independent variable so that its effects on the
dependent variable may be quantitatively or qualitatively analyzed
- An intervention that will benefit the participant in some way (Behavioral Cusp)
Methodologies developed through ABA research
Task analysis
Task analysis
is a process in which a task is analyzed into its component parts so
that those parts can be taught through the use of chaining: forward chaining, backward chaining
and total task presentation. Task analysis has been used in
organizational behavior management, a behavior analytic approach to
changing the behaviors of members of an organization (e.g., factories,
offices, or hospitals). Behavioral scripts often emerge from a task analysis. Bergan conducted a task analysis of the behavioral consultation relationship and Thomas Kratochwill developed a training program based on teaching Bergan's skills. A similar approach was used for the development of microskills training for counselors. Ivey would later call this "behaviorist" phase a very productive one and the skills-based approach came to dominate counselor training during 1970–90. Task analysis was also used in determining the skills needed to access a career. In education, Englemann (1968) used task analysis as part of the methods to design the Direct Instruction curriculum.
Chaining
The skill to be learned is broken down into small units for easy
learning. For example, a person learning to brush teeth independently
may start with learning to unscrew the toothpaste cap. Once they have
learned this, the next step may be squeezing the tube, etc.
For problem behavior, chains can also be analyzed and the chain can be disrupted to prevent the problem behavior. Some behavior therapies, such as dialectical behavior therapy, make extensive use of behavior chain analysis, but is not philosophically behavior analytic.
There are two types of chain in the ABA world: forward chain and
backward chain. Forward chain is when you start with the first step and
continue until you get to the final step. While backward chain is when
you start with the last step and move backward until you reach the first
step.
Prompting
A prompt is a cue that is used to encourage a desired response from an individual.
Prompts are often categorized into a prompt hierarchy from most
intrusive to least intrusive, although there is some controversy about
what is considered most intrusive, those that are physically intrusive
or those that are hardest prompt to fade (e.g., verbal).
In order to minimize errors and ensure a high level of success during
learning, prompts are given in a most-to-least sequence and faded
systematically.
During this process, prompts are faded as quickly as possible so that
the learner does not come to depend on them and eventually behaves
appropriately without prompting.
Types of prompts
Prompters might use any or all of the following to suggest the desired response:
- Vocal prompts: Words or other vocalizations
- Visual prompts: A visual cue or picture
- Gestural prompts: A physical gesture
- Positional prompt: e.g., the target item is placed close to the individual.
- Modeling: Modeling the desired response. This type of prompt is best
suited for individuals who learn through imitation and can attend to a
model.
- Physical prompts: Physically manipulating the individual to produce
the desired response. There are many degrees of physical prompts, from
quite intrusive (e.g., the teacher places a hand on the learner's hand)
to minimally intrusive (e.g., a slight tap).
This is not an exhaustive list of prompts; the nature, number, and
order of prompts are chosen to be the most effective for a particular
individual.
Fading
The
overall goal is for an individual to eventually not need prompts. As an
individual gains mastery of a skill at a particular prompt level, the
prompt is faded to a less intrusive prompt. This ensures that the
individual does not become overly dependent on a particular prompt when
learning a new behavior or skill.
One of the primary choices that was made while showing another
way of behaving is the manner by which to fade the prompts or prompts.
An arrangement should be set up to fade the prompts in an organized
style. For instance, blurring the actual brief of directing a kid's
hands might follow this succession: (a) supporting wrists, (b)
contacting hands softly, (c) contacting lower arm or elbow, and (d)
pulling out actual contact through and through. Fading guarantees that
the kid doesn't turn out to be excessively subject to a specific brief
while mastering another expertise.
Thinning a reinforcement schedule
Thinning is often confused with fading. Fading refers to a prompt being removed, where thinning refers to an increase in the time or number of responses required between reinforcements. Periodic thinning that produces a 30% decrease in reinforcement has been suggested as an efficient way to thin. Schedule thinning is often an important and neglected issue in contingency management and token economy systems, especially when these are developed by unqualified practitioners (see professional practice of behavior analysis).
Generalization
Generalization is the expansion of a student's performance ability beyond the initial conditions set for acquisition of a skill.
Generalization can occur across people, places, and materials used for
teaching. For example, once a skill is learned in one setting, with a
particular instructor, and with specific materials, the skill is taught
in more general settings with more variation from the initial
acquisition phase. For example, if a student has successfully mastered
learning colors at the table, the teacher may take the student around
the house or school and generalize the skill in these more
natural environments with other materials. Behavior analysts have spent
considerable amount of time studying factors that lead to
generalization.
Shaping
Shaping involves gradually modifying the existing behavior into the
desired behavior. If the student engages with a dog by hitting it, then
they could have their behavior shaped by reinforcing interactions in
which they touch the dog more gently. Over many interactions, successful
shaping would replace the hitting behavior with patting or other
gentler behavior. Shaping is based on a behavior analyst's thorough
knowledge of operant conditioning principles and extinction. Recent efforts to teach shaping have used simulated computer tasks.
One teaching technique found to be effective with some students,
particularly children, is the use of video modeling (the use of taped
sequences as exemplars of behavior). It can be used by therapists to
assist in the acquisition of both verbal and motor responses, in some cases for long chains of behavior.
Another example of shaping is when a toddler learns to walk. The
child is reinforced by crawling, standing, taking a few steps, and then
eventually walking. When a child is learning to walk, they are praised
by a lot of claps and excitements.
Interventions based on an FBA
Functional
behavioral assessment (FBA) is an individualized critical thinking
process for tending to address problem behavior. An evaluation is led to
distinguish the reason or capability of a problem behavior. This
evaluation interaction includes gathering data about the ecological
circumstances that go before the issue conduct and the resulting rewards
that reinforce the way of behaving. The data that is collected is then
used to recognize and execute individualized interventions pointed
toward lessening issue ways of behaving and expanding positive ways of
behaving.
Critical to behavior analytic interventions is the concept of a systematic behavioral case formulation with a functional behavioral assessment or analysis at the core. This approach should apply a behavior analytic theory of change (see Behavioral change theories).
This formulation should include a thorough functional assessment, a
skills assessment, a sequential analysis (behavior chain analysis), an
ecological assessment, a look at existing evidenced-based behavioral
models for the problem behavior (such as Fordyce's model of chronic
pain)
and then a treatment plan based on how environmental factors influence
behavior. Some argue that behavior analytic case formulation can be
improved with an assessment of rules and rule-governed behavior.
Some of the interventions that result from this type of
conceptualization involve training specific communication skills to
replace the problem behaviors as well as specific setting, antecedent,
behavior, and consequence strategies.
Careers in Applied Behavioral Analysis
There
is a wide range of job opportunities someone can get in the field of
applied behavior analysis. These fields also require a range of
schooling which can be beneficial for many people seeking a job in this
field.
- Behavior Technician – A behavior technician is someone
who can provide clinical instruction to children or adults with
developmental disabilities. This therapy can be provided in a school,
home, clinic, or community setting.
- Clinical Director – A clinical director is someone who oversees the therapy that is being given to clients.
- Special Education – In the special education system, someone
can use ABA skills to modify a child's behavior that is disruptive or
may cause harm to children or peers around them.
- Addictions – ABA skills can be used to treat and reduce addictions that may be destructive to someone.
- Animal Behavior Analyst – By using the same skills taught in
how to help people using ABA, they can also help animals. This is used
by finding effective reinforcers in order to modify animal behavior.
This can benefit both the animal and the owner.
- Correction Treatment Specialist (rehabilitation for criminal)
– criminal rehabilitation is seen both inside and outside of prisons.
By using ABA, someone will be able to reduce or eliminate incorrect
behaviors that are detrimental to clients.
- FBI/Criminal Profiler – Criminal profilers can use the skills
of ABA to catch criminals, create profiles of people, and train other
agents on how to recognize dangerous warning signs in people.
Major journals
Applied behavior analysts publish in many journals. Some examples of "core" behavior analytic journals are:
- Applied Animal Behaviour Science
- Behavioral Health and Medicine
- Behavior Analysis: Research and Practice
- Behavior and Philosophy
- Behavior and Social Issues
- Behavior Modification
- Behavior Therapy
- Journal of Applied Behavior Analysis
- Journal of Behavior Analysis of Offender and Victim: Treatment and Prevention
- Journal of Behavior Analysis of Sports, Health, Fitness, and Behavioral Medicine
- Journal of Contextual Behavioral Science
- Journal of Early and Intensive Behavior Interventions
- Journal of Organizational Behavior Management
- Journal of Positive Behavior Interventions
- Journal of the Experimental Analysis of Behavior
- Perspectives on Behavior Science (formerly The Behavior Analyst until 2018)
- The Behavioral Development Bulletin
- The Behavior Analyst Today
- The International Journal of Behavioral Consultation and Therapy
- The Journal of Behavioral Assessment and Intervention in Children
- The Journal of Speech-Language Pathology and Applied Behavior Analysis
- The Psychological Record
Other species
ABA has also been successfully used in other species. Morris uses ABA to reduce feather-plucking in the black vulture (Coragyps atratus).