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In operant conditioning a schedule of reinforcement that reinforces a response at unpredictable time intervals is the case of

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

Answer: D

A schedule that reinforces a response at unpredictable time intervals is a variable-interval schedule. The reinforcement depends on the passage of time, whose length varies from one reinforcement to the next, so the organism responds at a steady, moderate rate.

Fixed-ratio and variable-ratio schedules depend on the number of responses and not time, and a fixed-interval schedule reinforces after a fixed amount of time. Only the fourth option has time intervals that are unpredictable.

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