Licking Behavior of Rats on a Schedule of Food Reinforcement

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Science  12 Jan 1962:
Vol. 135, Issue 3498, pp. 99-101
DOI: 10.1126/science.135.3498.99


Rats were trained on a variable-interval food reinforcement schedule. Lever presses and licks at the milk reinforcement were recorded independently. A dose of d-amphetamine which increased lever-pressing rates failed to affect licking rates. Licking rates increased as the duration between reinforcements on the variable-interval schedule increased.