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When reinforcement occurs after completion of a variable number of responses, it is called .............

  • A.Fixed-interval schedule
  • B.Variable-interval schedule
  • C.Fixed-ratio schedule
  • D.Variable-ratio schedule

Answer: D

This is a Variable-ratio schedule.

In a ratio schedule reinforcement depends on the number of responses; in an interval schedule it depends on time. When the number of responses required varies unpredictably around an average, the schedule is variable-ratio. Slot machines work this way, and the schedule produces high, steady response rates and strong resistance to extinction.

A fixed-ratio schedule reinforces after a set number of responses, as in piecework. Fixed-interval and variable-interval schedules reinforce the first response after a fixed or varying amount of time, not after a number of responses.

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