Multiple-Baseline Design

What are the two potential problems associated with the removal of treatment in a reversal design?

A researcher is evaluating a new mnemonic device to help a student learn vocabulary. After the treatment phase, the student's memory performance remains high even during the withdrawal phase, failing to return to the original levels. True or False: In this scenario, the researcher can still definitively conclude that the mnemonic device was the cause of the improvement because the student's skills stayed better than they were at the start.

A researcher is evaluating a study where a successful behavior intervention was withdrawn, but the participant's behavior did not return to its original state. Arrange the steps in the logical order required to analyze why this specific outcome limits the study's conclusions.

True or False: A major limitation of the reversal design is that once a treatment is removed, the participant's behavior may not return to baseline levels, making it difficult to determine if the treatment was the actual cause of the change.

In a single-case experimental design that uses a reversal ($A-B-A$) design, a researcher observes that a participant's behavior does not return to baseline levels after the treatment is withdrawn. Why does this failure to return to baseline present a primary limitation for the study's conclusions?

In a reversal design, researchers transition from a treatment phase back to a baseline phase to establish that the treatment caused the observed change. Match each limitation of the reversal design with the research scenario that best illustrates it.

When a researcher chooses not to withdraw a successful treatment for self-injury in a reversal design because doing so would be unethical, the resulting causal evidence is considered _____, since the study can no longer rule out external factors as the cause of improvement.

Match each hypothetical single-subject research scenario with the specific limitation of the reversal design it demonstrates.

A researcher evaluates a social-skills intervention using a reversal design. After withdrawing the intervention, the participant's positive behavior remains high. Because the dependent variable does not return to baseline, the researcher cannot rule out alternative explanations (such as the participant making new friends), meaning this study suffers from a major threat to _____ validity.

A researcher is planning a single-subject study to test a new anxiety-reduction program. Order the steps the researcher should take to evaluate whether a reversal design is ethically and methodologically appropriate.

Describe the two primary limitations associated with the removal of treatment in a reversal design, as discussed in the context of single-subject research designs.

Based on the limitations of reversal designs, explain why the researcher should NOT withdraw the treatment in this scenario, and describe the methodological challenge they would face if they did withdraw the treatment but the patient's self-injurious behavior remained low.

A researcher implements a new reading intervention for a student using a reversal design. After the intervention is removed, the student's reading comprehension scores remain high. Apply the concepts of reversal design limitations to explain why this result prevents the researcher from claiming the intervention caused the improvement.