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Results
#1. A behavior analyst is reviewing a client’s data graph and observes a characteristic pattern where the client’s rate of responding is very low or non-existent immediately after reinforcement, gradually increasing to a high rate just before the next reinforcement is delivered. This pattern creates a ‘scallop’ shape on the cumulative record. Which basic schedule of reinforcement is most likely responsible for this observed pattern?
The scallop effect is a distinct and frequently observed pattern of responding associated with Fixed Interval FI schedules of reinforcement In an FI schedule the first response after a specific constant period of time has elapsed is reinforced Learners often learn to discriminate this temporal contingency leading to a pause in responding immediately following reinforcement known as a postreinforcement pause As the end of the interval approaches the probability of reinforcement increases causing the learner to gradually increase their rate of responding which then peaks just before the next reinforcement is delivered This acceleration of responding towards the end of the interval followed by a pause after reinforcement graphically appears as a scallop or hump on a cumulative record This contrasts with Fixed Ratio schedules which produce a high steady rate of responding with a postreinforcement pause Variable Ratio schedules which produce high steady rates without significant pauses and Variable Interval schedules which produce moderate steady rates without significant pauses or scallop effects
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