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Related Experiment Videos

Operant conditioning of single unit activity in parietal cortex

T D Steege, C A Robbins, A R Wyler

    Brain Research
    |January 14, 1982
    PubMed
    Summary

    Rhesus monkeys showed less control over parietal cortex neurons compared to precentral cortex neurons in an operant task. Shorter interspike intervals in parietal cells may explain this difference, suggesting peripheral mediation of neural control.

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    Area of Science:

    • Neuroscience
    • Neurophysiology
    • Primate Behavior

    Background:

    • Operant conditioning tasks are used to study neural control.
    • Previous studies focused on precentral cortex (motor cortex) neuron control.
    • Parietal cortex (sensory and spatial processing) neuron control is less understood.

    Purpose of the Study:

    • To compare the operant control of single neurons in the parietal cortex versus the precentral cortex in rhesus monkeys.
    • To investigate factors contributing to differences in neural control between these cortical areas.

    Main Methods:

    • Rhesus monkeys were trained to control firing patterns of single parietal and precentral cortical neurons using an operant task.
    • The number of controllable cells and their firing characteristics (e.g., interspike intervals) were analyzed.
    • Firing rate control and sustained tonic firing capabilities were assessed.

    Main Results:

    • A lower percentage of parietal cortex neurons (43%) were controllable compared to precentral cortex neurons (52%).
    • Monkeys achieved more sustained tonic firing rates in precentral units than in parietal units.
    • Parietal units exhibited significantly shorter modal interspike intervals (2 ms) compared to precentral units (25-50 ms).

    Conclusions:

    • Parietal cortex neurons are less amenable to operant control in this task, potentially due to their shorter interspike intervals.
    • More complex afferent connections to parietal neurons may also contribute to reduced control.
    • Findings indirectly support the hypothesis that operant control of cortical neurons is primarily peripherally mediated.

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