Abstract
Eight pigeons and 10 rats responded on variable interval 1-min or variable interval 30-s schedules. During baseline, the same operandum produced reinforcers throughout the session. During the switch conditions, performing one response produced reinforcers early in the session and performing a different response produced reinforcers later. The switch between the two responses occurred 10, 20, 30, or 40 min into the session in different conditions. Within-session patterns of responding were not usually different when the same operandum produced reinforcers throughout the session and when the operandum changed from the right to the left key (pigeons) or lever (rats). Changes from a treadle to a key (pigeons) or from a lever to a key (rats) also failed to alter within-session patterns of responding. These results suggest that factors related to the form of the instrumental response (e.g., muscular warm-up, fatigue) contributed little to within-session changes in responding under the present circumstances.
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