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Results

#1. Applied Behavior Analysis (ABA) research primarily utilizes single-subject experimental designs to evaluate the effectiveness of interventions. When discussing what is meant by the term single subject in this context, the most accurate and fundamental characteristic is that

A) Researchers are strictly limited to studying only one participant at any given time within a research study.

B) Each participant in the design serves as their own control, with their behavior in the intervention condition being directly compared to their own baseline behavior.

C) The research methodology inherently prohibits the incorporation of any other research methods, such as group designs, alongside the single-subject approach.

D) All participants are collectively compared against a single, separately recruited control group to assess overall intervention efficacy.

The fundamental concept of single subject in singlesubject experimental designs is that each individual participant functions as their own control This means that the participants behavior is measured repeatedly under a baseline condition before intervention and then under an intervention condition The changes observed in the participants behavior are attributed to the intervention by comparing the data from these different conditions for that same individual This withinsubject comparison is what allows for the demonstration of experimental control Option A is incorrect because singlesubject designs such as multiple baseline designs can involve multiple participants Option C is incorrect because mixed methods approaches combining singlesubject and group designs are possible Option D describes a characteristic of traditional group experimental designs not singlesubject designs where the focus is on individual behavior change

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