Instrumental and Motivationally Induced Drinking under Dry Food Reinforcement Schedules

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Abstract
2 experiments were conducted in which rats were exposed to a succession of response-independent and lick-contingent dry food reinforcement schedules with water freely available. The two experiments differed solely with regard to the preferability of a second solution which was made freely and concurrently available with the water. Differences in the rate and topography of pre- and post-pellet water drinking, as well as the transfer of post-pellet drinking from water to a highly preferred solution suggested that post-pellet drinking was under the control of motivational factors and only pre-pellet licking was under the control of the reinforcement contingency.