Fixed ratio and variable ratio schedules of reinforcement are both based on the number of responses. Thus, the given statement is true.
A schedule of reinforcement known as a fixed-ratio schedule only reinforces an answer after a certain number of replies. In essence, the subject responds a predetermined number of times, after which the trainer gives a reward.
A schedule of reinforcement known as a variable ratio schedule rewards a behavior after a certain number of replies. High, consistent response rates are the outcome of this type of timetable. Because they believe that the next reaction they give could be the one that gets them reinforcement, organisms are persistent in responding.
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