WITHIN‐SESSION CHANGES IN RESPONDING DURING SEVERAL SIMPLE SCHEDULES

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Abstract
Pigeons' key pecking was reinforced by food delivered by several fixed‐interval, variable‐ratio, and differential‐reinforcement‐of‐low‐rate schedules. Rate of responding, number of responses per reinforcer, length of postreinforcement pause, running response rate, and the time required to collect an available reinforcer changed systematically within sessions when the schedules provided high rates of reinforcement, but usually not when they provided low rates. These results suggest that the factors that produce within‐session changes in responding are generally similar for different schedules of reinforcement. However, a separate factor may also contribute during variable‐ratio schedules. The results question explanations for within‐session changes that are related solely to the passage of time, to responding, and to one interpretation of attention. They support the idea that one or more factors related to reinforcement play a role.

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