Which schedule tends to produce a pattern in which responding is initially low following a reward, but then gradually increases as the time for the next reward approaches?

Question

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Fixedterval schedules reinforce the first response after a fixed amount of time has passed since the last reward. This tends to produce a pattern in which responding is initially low following a reward, but then gradually increases as the time for the next reward approaches. This is because the subject learns that the reward will only be available after a certain amount of time has passed, and therefore starts to increase their responding as the time for the next reward approaches.

Which Schedule Tends to Produce a Pattern in Which Responding