In a _____ schedule, the number of responses it takes to obtain a reinforcer changes on each trial, but averages out to a certain number over many trials.

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A variable-ratio schedule is characterized by providing a reinforcement after a varying number of responses. The exact number of responses required for reinforcement changes from trial to trial, but the average number of responses needed to obtain reinforcement remains constant. This schedule produces high and steady rates of responding, as the animal or person will continue to perform the behavior in hopes of obtaining reinforcement, due to the uncertainty surrounding when the reinforcement will be delivered.

In a _____ Schedule, the Number of Responses It Takes