Abstract
Identical overall rates and patterns of key pecking by pigeons were maintained under a multiple fixed-interval schedule of food presentation. In one component, every thirtieth response produced an electric shock (punishment) whereas during the other component the response that produced food had to be preceded by a pause of a minimum (10 or 11 s) duration. Although chlordiazepoxide (1.0--17.0 mg/kg) increased both punished and unpunished responding, greater increases were uniformly obtained with punished responding.
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