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An Overview of Applied
Behavior Analysis and Definitions of Basic Terms
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Overview
of ABA | Glossary of Terms
Overview
of ABA
At
its most basic, Applied Behavior Analysis involves
setting up the optimal conditions
for a desired behavior to occur, teaching the behavior using scientifically
validated principles of reinforcement, then taking steps to ensure
that the new behavior continues after the teaching is over. The basic
features of the applied behavior analysis approach were described
in 1968 in a classic article by Donald Baer, Montrose Wolf, and Todd
Risley called, "Some
Current Dimensions of Applied Behavior Analysis."
Applied
behavior analysts are primarily interested
teaching natural, functional, self-maintaining skills so that people
can become more independent and effective in their environments.
All aspects
of behavior are considered--from simple responses such as
picking up objects to complex social skills. There is no point in
sending a child into the world with good basic skills but no ability
to interact effectively with other people. Similarly, a child with
good social skills but no understanding of basic academic academic
concepts would quickly fail in school. Fortunately, behavior
analysts were not only pioneers
in
basic skills training, but have
decades
of experience
with advanced social skills as well. These are all reasons why behavior
analysts tend to emphasize teaching that combines basic functional
activities with verbal expression and social interaction.
All
good ABA interventions are based on a careful analysis of the person's
needs
and capabilities,
individualized to the extent necessary. Behavioral
teaching is broken down into the smallest steps necessary for good
learning to occur. A child with no language and limited cognitive
skills would initially experience highly structured lessons designed
to teach the
basics: pointing, matching, sorting, following simple instructions,
etc. A learner with more advanced skills would have teaching at that
advanced level.Doing entire math
problems or successfully role-playing a difficult social interaction
might be
reinforced.
Because
all people
have a combination of more and less well-developed skills, teaching would
also be focused differently on different skills. A child with well-developed
hand-eye coordination but poor analytical comprehension might learn a
complex physical
activity at
the same time as learning the basics of cause-and-effect. There is no "one-size
fits all" in
applied behavior analysis.
Applied
behavior analysis is derived from almost 100 years of research
on the basic principles of behavior,
most specifically the work of B. F. Skinner. Thousands of studies of
the effectiveness of basic principles when applied to everyday problems
have been derived from tens of thousands of studies of the basic
principles of behavior. There is no better established, more empirically
validated, more effectively researched psychological intervention
system than ABA.
Because all good
ABA programs are built from well-established basic
principles,
even when the optimum overall outcome is not reaced, they are usually
successful at achieving their specific goals. All types of ABA, including
Lovaas
Therapy,
Discrete
Trial
Training
(DTT),
Pivotal
Response Training (PRT), Verbal Behavior Analysis (VBA), and many
others are variations on a basic formula of systematically combining
basic behavioral principles to produce the desired outcomes. Because
the tradition of behavior analysis includes the ongoing objective
measurement
and analysis of data, well-designed applied behavioral programs measure
performance and make adjustments to the teaching as necessary. In
a good ABA program, everyone will always know if progress is being
made.
Below
are some basic behavioral definitions to aid the user in understanding
the concepts introduced in the BAAM videos. Most of these are everyday
definitions rather than technical ones. For a more technical discussion
of these concepts, please refer to any good applied behavior analysis
textbook or go to the behavior analysis glossary sponsored by the University
of South Florida. Advanced verbal behavior terms can be found
on Mark
Sundberg's site.
Glossary
of Basic Behavioral Terms
Applied
Behavior Analysis (ABA)
The
use of scientific established principles of learning to create
effective and humane outcome-based therapies with the primary goal of
establishing
and enhancing socially important
functional independent living skills.
In
practice, ABA uses techniques based on learning theory to shape important
new behaviors in individuals
with specific behavioral excesses and
deficits. ABA interventions typically
include the following components:
-
A
data-based functional analysis or assessment of the conditions
responsible for the problem behavior.
-
Specific
and verifiable treatment goals and objectives.
-
A
well-defined intervention plan using reinforcement theory principles
to meet the goals
and objectives.
-
Ongoing
data collection and analysis to show that the intervention was
actually responsible for the treatment gains.
-
A
plan to ensure the generalization and maintenance of treatment
gains.
-
Measures
to ensure the social validity of the treatment goals and objectives,
and to ensure
that all those affected by the treatment can
contribute
substantially and constructively to all its elements.
Eliminating
self-injury
and teaching academic skills to children with autism,
re-establishing independent
living skills in people with brain injuries, training
appropriate toileting in children with enuresis, improving medical
compliance
in
people with
illnesses, establishing effective study habits in
at-risk school children, reducing repetitive habits such as nail
biting
and trichtotillamania,
and reinforcing appropriate social behavior in people
with social skills
deficits are illustrative of, but do not exhaust,
the range of behavior issues addressed by applied behavior analysts.
An excellent technical introduction to the basic philosophy
of applied behavior analysis interventions can be found here.
Antecendent-Behavior-Consequence
(ABC)
Format
A
standard teaching and functional analysis format that consists of
a discriminative stimulus (including prompts), a response,
and a consequence.
The
ABC format is a simplified
version of the three-term-contingency and
resembles a discrete-trial frame.
antecedent
|
behavior
|
consequence
|
Mom
prompts for the response
|
The
child does the response
|
Mom
reinforces immediately and generously
|
Behavior
Any activity of any organism. The term "behavior" encompasses
both externally observable responses such as running or speaking as
well as private behavior such as thinking, feeling, and dreaming.
A
predefined relationship between events.
Verbal reinforcement which incorporates
a specific description of the desirable or targeted elements of the
reinforced response.
Descriptive
praise should be given positive form (e.g., “Thank you Jeff.
Putting the plate in the sink was very helpful!) rather than in negative
form (e.g., Thank you Jeff. I like the way you didn’t
leave your plate on the table).
Discrete-Trial Training (DTT)
A
type of ABA intervention most often associated with Ivar Lovaas in
which teaching is structured into a series of discrete-trial
frames consisting of four or five specific parts based on the three-term-contingency:
-
Discriminative
stimulus (SD): the event that should prompt the response
-
Prompting
stimulus or prompt (SP)--the instruction or cue given
by the teacher to encourage the response.
This prompt will be faded.
-
Response
(R)--the specifically defined target response.
-
Reinforcing
stimulus or reinforcer (SR)--the event which teaches
and maintains the response.
-
Intertrial-interval
(ITI)--a specific period of time between discrete trial frames.
Thus, a discrete trial frame would look like this:
SP |
SD |
R |
SR |
Teacher
asks "What is this color?" |
Holds up blue object |
The
child says "blue" |
The
teacher
reinforces immediately and generously |
The SD and SP would
likely occur at the same time, and the SP would
eventually be faded.
Behavior
of any complexity may be taught by this method if individual responses
are
chained into longer responses, or if the learner is capable
of following complex instructions
Echoic
An instance of verbal behavior that matches the form
of other verbal behavior. Echoics are often used in ABA training to
teach new verbal behavior. Apparently non-functional echoic behavior
in children with autism is called "echolalia."
Extinction
The reduction in a response due to a lack of reinforcement.
Extinction Burst:
A temporary increase in the probability
of an operant response during extinction.
Extinguish
To reduce a behavior by using extinction.
Functional
Analysis
A
systematic, experiment examination of the conditions that support
a target behavior. A functional analysis will identify the reinforcers,
prompts, and other motivating conditions for a target response.
Functional
Assessment
A
systematic, non-experimental survey of the conditions that are likely
support a target behavior. A functional analysis will attempt to
identify the reinforcers, prompts, and other motivating conditions
for a target
response.
Generalization
The
spread of the effects of teaching to new and different settings.
If the child learns to say "please" and "thank-you" at
home, but then does it at school, we say that the "please" and "thank
you" have generalized.
Intraverbal
A piece of verbal behavior that is controlled by other
verbal behavior. A common example is rhyming in poems where the word
choices in later lines are governed by choices in earlier lines.
Maintenance
The persistence of teaching across time. Teaching is
said to have maintained if is exhibited indefinitely into
the future.
Mand
A piece of verbal behavior that is caused by a need for
something and often specifies what will reinforce it. "Please get me
a drink" is a mand. Most requests and questions are mands. A mand need
not be vocal. Pointing to an object in order to get it would also be
a
mand.
Operant
Conditioning
Learning
that is based on reinforcement. Applied behavior analysis teaching
is based primarily on operant learning.
Pavlovian
Conditioning (Classical Conditioning)
Learning
that is based on pairings of events. For instance, if a dog barks
loudly enough to scare a child, the child might become afraid
of the dog.
Pavlovian
conditioning is not typically emphasized in applied
behavior
analysis. Its primary role is creating new reinforcers
by pairing. Verbal praise is made reinforcing by pairing it with
established
non-verbal
reinforcers.
Pavlovian
techniques are commonly used to eliminate phobias and unnecessary
anxiety, usually by repeatedly presenting
the anxiety-producing object until the anxiety extinguishes.
Prompt
Any instruction, action, or other event that sets the
occasion for a response to occur.
-
Gestural Prompts: Physical motions such a pointing or
waving.
-
Manual or Physical Prompts: Touching or otherwise physically
guiding the organism through all or part of the response.
-
Verbal Prompts: Verbal responses, such as instructions,
designed to increase the probability of a target response:
A
problem in which the learner's behavior is insufficiently independent
and requires frequent, specific prompting.
Reducing
frequency or specificity of prompts in order to reduce prompt-dependency
and
increase generalization.
Any
behavior that produces a "punisher" will happen less
often. Punishment is rarely employed in ABA interventions for a
variety of ethical and practical reasons.
A
punisher is any event, which when it occurs during
or shortly after a response, increases the future likelihood
of the response.
Common punishers are pain and social disapproval.
Anything can be a punisher, even what might seem to be
to be positive. For
instance, cheerful approval might be punishing
to someone who is in a "bad
mood."
-
Positive
punisher ("punisher"): Punishes by presentation.
-
Negative
reinforcer ("response cost" or "penalty"):
Reinforces by removal.
-
Primary
punisher: Punishes without previous conditioning.
-
Conditioned
Punisher: Punishes due to previous conditioning.
A new "conditioned
punisher" or "conditioned aversive stimulus" can
be created by reliably presenting the new
punisher with an established punisher. A
parent who punishes can become a conditioned
punisher.
Any
behavior that produces a "reinforcer" will happen more often. Most
behavioral interventions for developmental disabilities try to build
new, functional behaviors by using reinforcement. ABA even tries
to get rid of troublesome behaviors by reinforcing behavior that
will be more useful or appropriate.
A reinforcer
is any event, which when it occurs during or shortly after a response,
increases the future likelihood of the
response. Common reinforcers are food, affection, and attention.
But anything can be a reinforcer, even what might seem to be negative
attention.
-
Positive reinforcer: Reinforces by presentation.
-
Negative
reinforcer: Reinforces by removal.
-
Primary Reinforcer: Reinforces
without previous conditioning.
-
Conditioned Reinforcer: Reinforces
due to previous conditioning. A new "conditioned reinforcer" can
be created by reliably presenting
the
new reinforcer
with an established
reinforcer.
Affecting
the probability of a response by the presentation of discriminative
stimuli and prompts. For instance, a written direction on a
door, "knob sticks, turn hard," would be an example
of a stimulus control.
To say that "stimulus control is lacking" means that discriminative
stimuli or prompts are not setting the occasion for the response.
Target
Response (Target Behavior)
The
specific goal response in an ABA teaching program. The target
response should be defined specifically and be expressed
in measurable terms.
A
period of non-reinforcement in which the subject’s
contact with the ongoing activity temporarily interrupted.
The
time out procedure combines extinction, mild punishment, stimulus
control, and
reinforcement.
-
Extinction occurs when the inappropriate behavior is
no longer functional
-
Punishment is effected by the loss
of social contact and contact with other conditioned reinforcers
present
in the teaching situation
-
Stimulus
control is manifested in the abrupt change in stimulus
conditions which previously set the occasion for inappropriate responding
to conditions which do not support the unwanted responding
-
Reinforcement
occurs
when the subject is allowed to return to the situation
after exhibiting
socially appropriate behavior (or at least none of the
inappropriate behavior).
In
effective ABA programs, the use of time-out and punishment is rare.
A
description of the basic unit of operant behavior. the
three-term contingency is used to teach and analyze behavior.
SD
Discriminative Stimulus |
R
Response |
|
A painfully bright light shines in your
eyes |
You
close your eyes |
Pain
from bright light is reduced |
Verbal Behavior
Behavior which is reinforced by other people. Verbal
behavior generally consists of vocal communication, but can have any
form.
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