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#1. A Board Certified Behavior Analyst (BCBA) is analyzing a cumulative record of a client’s puzzle-completion behavior under a specific reinforcement schedule. The record displays a characteristic pattern of a flat line or very low response rate at the beginning of an interval, followed by a sudden, sharp increase in responding towards the end of the interval, resembling an accelerating curve or ‘scallop.’ Which of the following basic reinforcement schedules is most likely producing this observed scallop effect?
This question assesses knowledge of the distinctive response patterns generated by basic reinforcement schedules a fundamental concept in the experimental analysis of behavior and Applied Behavior Analysis Option C Correct A Fixed Interval FI schedule delivers reinforcement for the first response that occurs after a fixed amount of time has elapsed Learners quickly learn to discriminate this temporal contingency They typically exhibit a low rate of responding often a postreinforcement pause immediately after receiving reinforcement because they understand that further responses during the early part of the interval will not produce additional reinforcement As the end of the fixed interval approaches the response rate progressively increases and then accelerates sharply leading to a high rate of responding just before reinforcement is due This pattern when plotted on a cumulative record creates the characteristic scallop shape representing periods of low responding followed by accelerating responding Option A Incorrect A Fixed Ratio FR schedule delivers reinforcement after a fixed number of responses This schedule typically produces a high steady rate of responding once the individual begins to respond often accompanied by a postreinforcement pause immediately following reinforcement However this pause is usually followed by an immediate return to a high steady rate not a gradual acceleration that characterizes the scallop effect Option B Incorrect A Variable Ratio VR schedule delivers reinforcement after a variable number of responses This unpredictable schedule produces a very high and steady rate of responding with little or no postreinforcement pause The learner consistently responds at a high rate because any given response could be the one that leads to reinforcement thus eliminating the scallop effect Option D Incorrect A Variable Interval VI schedule delivers reinforcement for the first response after a variable amount of time has elapsed This unpredictability in the interval length results in a moderate steady rate of responding with very little or no postreinforcement pause The learner cannot discriminate the passage of time in a way that would produce a scallop effect as reinforcement could occur at any point after the variable interval has passed
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