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ABAB Design
An ABAB design is an extension of the basic reversal design that involves an initial baseline phase (A), a treatment phase (B), a return to baseline through the removal of the treatment (A), and a second reintroduction of the treatment (B). For example, Hall and his colleagues utilized an ABAB design to demonstrate that a student's studying behavior increased when positive attention was provided, decreased when it was removed, and increased again when it was reintroduced.

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Clinical Practice of Psychology
Psychology
Social Science
Empirical Science
Science
KPU
Research Methods in Psychology - 4th American Edition @ KPU
OpenStax Psychology (2nd ed.) Textbook
Related
Baseline Phase
Treatment Phase
Internal Validity of Reversal Designs
Multiple-Treatment Reversal Design
Alternating Treatments Design
ABAB Design
Internal Validity in Reversal Designs
ABAB Reversal Design Example
Limitations of Reversal Design
Arrange the phases of a fundamental reversal design (ABA design) in the correct chronological order.
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Disadvantages of ABAB Design
Arrange the phases of an ABAB design in the correct chronological order.
ABAB Reversal Design Example
Arrange the phases of an ABAB research design in their correct chronological order.
A researcher uses an ABAB design to test whether a relaxation technique reduces anxiety in a client. During the first treatment phase, the client's anxiety decreases. When the treatment is temporarily removed, anxiety increases again. The treatment is then reintroduced and anxiety decreases once more. What is the primary reason the researcher includes the final treatment phase rather than ending the study after the return-to-baseline phase?