In a certain experiment, reinforcement is contingent upon each response being separated by at least a certain period of time. This sounds like a schedule.

DRL

Explanation:

Based on the information provided within the question it can be said that this sounds like a Differential reinforcement of low rates of behavior (DRL) schedule. This is a schedule created by Ferster and Skinner in 1957 which they describe as being a schedule in which a certain amount of time must pass in between two responses before reinforcement is introduced to the individuals.

haile selassie i was the emperor of ethiopia from 1930-1974

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