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The hippocampus, time and working memory.

J N Rawlins, E Tsaltas

    Behavioural Brain Research
    |December 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Hippocampal lesions in rats impair working memory, especially with longer delays between responses and rewards. This suggests hippocampal damage affects intermediate memory but not short-term or long-term memory.

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    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Animal Models

    Background:

    • The hippocampus plays a crucial role in memory formation and retrieval.
    • Working memory tasks are essential for understanding cognitive deficits associated with brain damage.

    Purpose of the Study:

    • To investigate the impact of hippocampal lesions on working memory performance in rats.
    • To determine how the duration of inter-response intervals (IRIs) and reward contingencies affect performance after hippocampal damage.

    Main Methods:

    • Rats with hippocampal lesions (HC), cortical control lesions (CC), or sham operations (SO) were trained on a leverpress alternation task.
    • The task involved a forced information response followed by a free choice stage, with varying inter-response intervals (IRIs) and reward conditions.

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  • Performance was measured by choice accuracy.

    • Main Results:

    • When the information response was not rewarded, all groups performed similarly.
    • When the information response was rewarded, HC rats showed significantly impaired choice accuracy, particularly at longer IRIs.
    • Increasing the number of leverpresses required for the information response improved accuracy for all groups, with no interaction with lesion type.

    Conclusions:

    • The length of the IRI and events occurring during it critically influence hippocampal lesion-induced working memory deficits.
    • Hippocampal damage is proposed to disrupt an intermediate-term memory buffer, while sparing short-term memory and long-term associative retention.
    • This suggests that reference memory tasks may also be impaired by hippocampal lesions when reward delays are introduced.