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#1. A Board Certified Behavior Analyst (BCBA) is implementing an A-B-A-B reversal design to evaluate the effectiveness of a new social skills intervention for a client. After an initial baseline phase (A), the intervention is introduced (B), leading to a significant increase in the client’s social interactions. The BCBA then systematically withdraws the intervention, returning to baseline conditions (second A phase), and observes a subsequent decrease in social interactions, which return to levels similar to the initial baseline. This specific withdrawal of the intervention and the observed change in behavior primarily serves to fulfill which component of baseline logic?
The ABAB reversal design is a powerful experimental design used to demonstrate functional control It involves alternating phases of baseline A and intervention B The critical component for demonstrating functional control specifically addressed by withdrawing the intervention and observing a return to baseline levels is verification Verification occurs when after the independent variable intervention has been shown to affect the dependent variable behavior the independent variable is withdrawn and the behavior reverts to its original baseline levels This observed return to baseline significantly increases the probability that the observed changes during the intervention phase were indeed due to the independent variable and not due to extraneous variables If the behavior does not return to baseline it would suggest that other factors might be at play or that the intervention produced a lasting effect making verification of functional control more complex within this specific design Prediction involves observing stable baseline data to predict that the behavior would remain at that level if no intervention were applied Replication involves reintroducing the intervention and observing a return to the desired behavior change further strengthening the evidence of functional control Stability refers to a consistent level of responding in a given phase which is a prerequisite for making accurate predictions and demonstrating control but not a component of baseline logic itself in the same way as prediction verification and replication
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