- Single-subject research
Single-subject research is the extreme case of "small-n" research. It is often used in situations where only "quasi-experimental" research designs are applicable. This group of research methods is used extensively in the
experimental analysis of behavior andapplied behavior analysis with both human and non-human subjects. Four principal methods in this type of research are: changing criterion, reversal ("ABA"), alternating treatments, and multiple baseline. In verbal behavior research a multipleprobe research method is often used as well.Behavior analysis is data driven, inductive, and disinclined to hypothetico-deductive methods [Chiese, Mecca. (2004). "Radical Behaviorism: The Philosophy and the Science".] . Statistical methods, from "The Behavior of Organisms" (Skinner 1938) until now, have been largely ignored. [cite journal | author=Michael J |title=Statistical inference for individual organism research: mixed blessing or curse? |journal=Journal of Applied Behavior Analysis |volume=7 |issue=4 |pages=647–653 |pmid=16795486 |doi=10.1901/jaba.1974.7-647 |year=1974]
AB research designs
The AB design is the simplest version of this design in which a baseline ("A") is tracked, and then some treatment ("B") is implemented. If there is a change then the treatment is said to have had an effect. However, it is subject to many possible competing hypotheses, making it a very weak research design. The other variants essentially introduce ways to control for the competing hypotheses.
Changing-criterion research designs
In a changing-criterion research design a criterion for reinforcement is changed across the experiment to demonstrate the functional relationship between the reinforcement and the behavior. See Mark Dixon's work with a participant using a short video clip as a reinforcer to reinforce him for engaging in physical therapyFact|date=May 2007
Reversal or ABA designs
The reversal design is the most powerful of the single-subject research designs showing a strong reversal from baseline ("A") to treatment ("B") and back again. However, many interventions cannot be reversed, some for ethical reasons (e.g., involving self-injurious behavior, smoking) and some for practical reasons (they cannot be unlearned, like a skill) [cite book| last =Kazdin| first = Alan| title = Single-Case Research Designs| publisher =Oxfor University Press| date = 1982| location = New York| isbn =0195030214 ]
Alternating-treatment designs
The alternating-treatment design is used in order to ascertain the comparative effect of two treatments. Two treatments are alternated in rapid succession and correlated changes are plotted on a graph to facilitate comparison [cite book |author= Cooper JO, Heron TE, Heward WL |title= Applied Behavior Analysis |edition= 2nd ed. |date=2007 |publisher= Prentice Hall |isbn=0-13-142113-1] .
Multiple-baseline designs
The multiple baseline design was first reported in 1960 as used in basic operant research. It was applied in the late 1960s to human experiments in response to practical and ethical issues that arose in withdrawing apparently successful treatments from human subjects. [Hersen, Michael and Barlow, David H. (1976) "Single-case Experimental Designs: Strategies for Studying Behavioral Change". Pergamon, New York] In it two or more (often three) behaviors, people or settings are plotted in a staggered graph where a change is made to one, but not the other two, and then to the second, but not the third behavior, person or setting. Differential changes that occur to each behavior, person or in each setting help to strengthen what is essentially an AB design with its problematic competing hypotheses.Fact|date=May 2007
Multipleprobe designs
Popular in
Verbal Behavior research, the multiproble research design has elements of the other research designs.Fact|date=May 2007ee also
*
Single subject design
*Applied behavior analysis
*Verbal behavior
*BF Skinner References
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