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High frequency electrical stimulation entrains fast spiking interneurons and bidirectionally modulates information

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    High-frequency electrical stimulation differentially affects fast spiking interneurons (FSIs) across brain regions. This study reveals region-specific entrainment and modulation of FSI temporal processing, impacting network information flow.

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    Area of Science:

    • Neuroscience
    • Computational Neuroscience

    Background:

    • Clinical intracranial electrical stimulation uses high-frequency pulse trains.
    • The influence of these stimulation patterns on neural dynamics remains unclear.

    Purpose of the Study:

    • To investigate how high-frequency electrical stimulation modulates fast spiking interneurons (FSIs).
    • To understand the brain-region-specific effects of electrical stimulation on neural activity.

    Main Methods:

    • Real-time voltage imaging in awake mice to assess FSI responses to 40 Hz and 140 Hz stimulation.
    • Characterization of stimulation effects in motor and visual cortices, free of electrical artifact.

    Main Results:

    • Both 40 Hz and 140 Hz stimulation heterogeneously modulated FSI membrane voltage, creating complex temporal dynamics.
    • 40 Hz stimulation robustly entrained FSIs in both cortices, with differential hyperpolarization effects.
    • 140 Hz stimulation entrained visual cortical FSIs but not motor cortical ones, and bidirectionally modulated visual cortical FSI temporal precision.

    Conclusions:

    • High-frequency electrical stimulation induces brain-region-specific entrainment of FSIs.
    • Stimulation bidirectionally modulates FSI temporal processing of synaptic inputs, differentially engaging inhibitory neurons to alter network information processing.