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Concurrent drinking by pigeons on fixed-interval reinforcement schedules.

R H Dale

    Physiology & Behavior
    |November 1, 1979
    PubMed
    Summary
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    Pigeons exposed to fixed-interval schedules showed drinking patterns related to food reinforcement rates. Their rapid, brief drinking bouts differ from rats, potentially explaining challenges in observing schedule-induced polydipsia in pigeons.

    Area of Science:

    • Behavioral neuroscience
    • Animal behavior

    Background:

    • Schedule-induced polydipsia is a phenomenon where animals increase water intake under certain reinforcement schedules.
    • Pigeons' drinking behavior under fixed-interval (FI) schedules is not well-characterized, especially in comparison to other species like rats.

    Purpose of the Study:

    • To investigate drinking patterns in pigeons under various food-reinforced fixed-interval (FI) schedules.
    • To compare pigeon drinking parameters with those of rats to understand differences in schedule-induced polydipsia.

    Main Methods:

    • Three experienced pigeons were subjected to 100-minute sessions across FI 50-sec, FI 100-sec, and FI 200-sec schedules.
    • Water intake, drinking bout duration, rate, and frequency were recorded.
    • Food reinforcement rate was manipulated via the schedule parameters.

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    Main Results:

    • Pigeon water intake was directly proportional to the food reinforcement rate.
    • Drinking occurred primarily within the initial third of each fixed interval.
    • Pigeons exhibited rapid drinking (3-4 ml/sec) with brief (0.8-1.4 sec) and infrequent (2-5/hr) bouts.

    Conclusions:

    • Pigeon drinking behavior under FI schedules is characterized by rapid, brief, and infrequent bouts.
    • The distinct drinking parameters in pigeons, compared to rats, may account for the difficulties in inducing polydipsia in this species.
    • Further research is needed to elucidate the neurobiological mechanisms underlying these species-specific differences in water intake behavior.