Effect of schedule on reinforcement and stomach loads on bar pressing by thirsty rats.

Abstract
IN 2 EXPERIMENTS, THIRSTY RATS BAR PRESSED FOR WATER REINFORCEMENTS ON DIFFERENT VARIABLE INTERVAL SCHEDULES AFTER STOMACH LOADS OF WATER OR SALINE. WATER LOADS ALWAYS DEPRESSED RESPONDING. SALINE LOADS SOMETIMES DECREASED AND SOMETIMES INCREASED NUMBERS OF RESPONSES, DEPENDING ON THE SPECIFIC EXPERIMENTAL CONDITIONS. MAXIMUM RESPONSE RATES PER SE WERE NEVER FACILITATED BY LOADS, HOWEVER, ONLY BY PERSISTENCE OF RESPONDING TOWARD THE END OF A SESSION. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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