Rats were trained on schedules in which the rate of responding in one inter-reinforcement time (ISRT) determined the minimum duration of the following ISRT. The durations of the four ISRTs which were used were related in a simple arithmetic ratio; T, 2T, 3T, and 4T sec. For one group high rates in the current ISRT shortened the following ISRT from the basic value of 4T sec. A high response rate lengthened the next ISRT from the basic value of T sec. in the other group. Ss in each group were able to approximate the response rate which would result in maximum reinforcement density.
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