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Schedule-induced drinking: entrainment by fixed- and random-interval schedule-controlled feeding

J D Keehn, M Burton

    T.-I.-T. Journal of Life Sciences
    |January 1, 1978
    PubMed
    Summary
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    Intermittent food reinforcement in rats encourages drinking behavior, leading to polydipsia when drinking opportunities don't interfere with feeding. This highlights the combined reinforcing effects of food and water.

    Area of Science:

    • Behavioral neuroscience
    • Animal behavior studies
    • Reinforcement learning

    Background:

    • Underweight rats exhibit polydipsia under specific reinforcement schedules.
    • Previous research indicates complex interactions between feeding and drinking behaviors.

    Purpose of the Study:

    • To investigate the relationship between intermittent food reinforcement and drinking patterns in rats.
    • To understand the conditions under which polydipsia develops in relation to feeding opportunities.

    Main Methods:

    • Six underweight rats were subjected to fixed-interval (FI 60-sec) and random-interval (RI 60-sec) schedules of food reinforcement.
    • Behavioral responses, including bar-pressing for food and drinking, were monitored.
    • Drink durations and licking patterns were analyzed in relation to reinforcement schedules.

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    Main Results:

    • Rats displayed a polydipsic drinking pattern, with bursts of licking post-reinforcement under the FI schedule.
    • Under the RI schedule, rats frequently alternated between bar-pressing and drinking.
    • Mean drink durations were shorter than inter-reinforcement times, but longer drinks were observed under the FI schedule.

    Conclusions:

    • Intermittent food reinforcement entrains drinking behavior due to the combined reinforcing value of food and water.
    • Polydipsia develops when opportunities for drinking do not compete with feeding opportunities, suggesting a balance in reinforcement-seeking behavior.