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Results
#1. A Board Certified Behavior Analyst (BCBA) is implementing an A-B-A withdrawal design to evaluate the effectiveness of a reading fluency intervention for a 3rd-grade student. During the initial baseline (A1) phase, the student’s average reading fluency is 5 words per minute. Upon introducing the intervention (B), the student’s fluency increases to an average of 10 words per minute. When the intervention is subsequently withdrawn and the condition returns to baseline (A2), the student’s reading fluency surprisingly remains at an average of 10 words per minute. This outcome, where the effects of the intervention could not be reversed upon its withdrawal, is best described as
Irreversibility occurs when the changes in behavior brought about by an intervention cannot be reversed or returned to baseline levels even after the intervention has been withdrawn This phenomenon is often observed when a skill such as academic fluency like reading or math has been effectively taught and acquired by the learner Once a skill is learned to a high degree of proficiency it becomes difficult or undesirable to unteach it meaning the behavior maintains even in the absence of the intervention In this specific scenario the students reading fluency maintained at 10 words per minute during the A2 phase despite the withdrawal of the intervention clearly indicating that the skill was acquired and not easily reversed Multiple treatment interference refers to the effects of one treatment carrying over and influencing the outcome of subsequent treatments which is typically a concern in multielement or alternating treatments designs Sequence effects are a type of multiple treatment interference where the order in which experimental conditions are presented affects the results Reversibility is the opposite of irreversibility it implies that the behavior does return to baseline levels when the intervention is removed which is a key characteristic for demonstrating experimental control in withdrawal designs when a behavior can be reversed
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