Maintenance of Responding under a Fixed-Interval Schedule of Electric Shock-Presentation

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Science  14 Jun 1968:
Vol. 160, Issue 3833, pp. 1249-1251
DOI: 10.1126/science.160.3833.1249


Squirrel monkeys trained to respond under a schedule in which each response postponed the delivery of electric shock developed a steady rate of responding. When a schedule in which an electric shock was presented following the first response occurring after 10 minutes (10-minute fixed-interval schedule) was programed concurrently, there was little effect on the pattern of responding. When the shock-postponement schedule was eliminated, the fixed-interval schedule of shock-presentation maintained a pattern of positively accelerated responding that is characteristic of fixed-interval schedules of reinforcement.

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