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Cumulative Record. Chapter 40: “Superstition” in the Pigeon. Quote 4

When we arrange a clock to present food every 15 sec., we are in effect basing our reinforcement upon a limited set of responses which frequently occur 15 sec. after reinforcement. When a response has been strengthened (and this may result from one reinforcement), the setting of the clock implies an even more restricted contingency. (p. 574)