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The hippocampus, collateral behavior, and timing.

J N Rawlins, G Winocur, J A Gray

    Behavioral Neuroscience
    |December 1, 1983
    PubMed
    Summary
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    Rats with hippocampal lesions showed improved performance on a differential reinforcement of low rates (DRL) schedule when an auditory cue was introduced. This suggests the hippocampus plays a role in timing-dependent learning.

    Area of Science:

    • Neuroscience
    • Behavioral Neuroscience
    • Cognitive Psychology

    Background:

    • The hippocampus is crucial for learning and memory.
    • Understanding hippocampal function requires examining its role in temporal processing and reinforcement learning.

    Purpose of the Study:

    • To investigate the role of the hippocampus in performance on a differential reinforcement of low rates (DRL) schedule.
    • To explore factors influencing DRL performance in rats with hippocampal lesions (HC).

    Main Methods:

    • Rats with hippocampal lesions, cortical control lesions, or sham operations were trained on a DRL schedule (12-sec inter-response time).
    • Four experiments manipulated factors including collateral behavior, limited hold, drug administration (chlordiazepoxide HCl), and an auditory cue.
    • Performance efficiency was measured across conditions.

    Related Experiment Videos

    Main Results:

    • Extra opportunities for collateral behavior did not differentially affect groups.
    • Limited hold and chlordiazepoxide administration reduced DRL efficiency in all groups.
    • An auditory stimulus marking the DRL interval's midpoint differentially improved HC group performance.

    Conclusions:

    • The hippocampus is involved in temporal processing critical for DRL performance.
    • Specific environmental manipulations, like auditory cues, can selectively benefit hippocampal lesioned subjects in timing tasks.
    • Findings inform theories of hippocampal function regarding temporal cognition.