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    Area of Science:

    • Neuroscience
    • Behavioral Science

    Background:

    • Loss of parvalbumin-expressing interneurons (PV+) in the striatum is linked to impulsive behaviors.
    • The precise role of these interneurons in striatal information processing and action control remains unclear.

    Purpose of the Study:

    • To investigate the function of PV+ interneurons in the sensorimotor striatum during action waiting and execution.
    • To elucidate the role of PV+ interneurons in regulating impulsive and controlled behaviors.

    Main Methods:

    • Compared neural spiking activity of five identified neuron types in unrestrained rats during a cued-action task.
    • Utilized optogenetic suppression of PV+ interneurons at different task phases (waiting vs. action initiation).

    Main Results:

    • PV+ interneurons selectively increased firing during the waiting period, and their suppression led to premature movements, indicating a role in action restraint.
    • Suppression of PV+ interneurons after the cueing resulted in delayed action initiation and execution.
    • Distinct, rapid striatal firing sequences involving spiny projection neurons (SPNs) and PV+ interneurons were observed during actions, with PV+ inhibiting SPNs.

    Conclusions:

    • PV+ interneurons are critical for both restraining premature actions and enabling timely action initiation and execution.
    • These interneurons precisely sculpt striatal output through synchronized firing and inhibition of SPNs, ensuring fluid and appropriately timed motor behavior.