Punishment with various intensities of bar shock of every 2nd, 4th, or 8th response by rhesus monkeys was studied against a variable-interval schedule of food reinforcement. Negatively accelerated response rates between punishments appeared as shock intensity increased. Increasing the intensity of punishment increased the latency of the first response after food reinforcement more than the latencies of other responses. The interaction of punishment with time since last reinforcement may indicate that response strength on unpunished variable-interval schedules increases between reinforcements.
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