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Large-Scale Circuitry Interactions Upon Earthquake Experiences Revealed by Recurrent Neural Networks.

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    This study models mouse brain dynamics during fear, revealing distinct theta and gamma band connectivity changes. These findings offer new insights into how the brain processes fearful stimuli and relates to its structure.

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    Area of Science:

    • Neuroscience
    • Computational Neuroscience
    • Systems Neuroscience

    Background:

    • Understanding large-scale brain dynamics is crucial for neuroscience.
    • Studying mouse brain dynamics using local field potential (LFP) recordings presents significant challenges.
    • Fear processing involves complex neural circuitry and dynamic network changes.

    Purpose of the Study:

    • To model large-scale mouse brain dynamic activities in response to a fearful stimulus (earthquake).
    • To investigate changes in power and theta-gamma coupling during different stages of the fear response.
    • To analyze functional brain connectivity patterns in theta and gamma bands during fear.

    Main Methods:

    • Utilized local field potential (LFP) recordings from 13 brain regions in mice.
    • Applied an effective Bayesian connectivity change point model to analyze LFP data.
    • Developed a recurrent neural network model to simulate functional dynamics across brain regions and frequency bands.

    Main Results:

    • Divided the fear response into four stages: Before, Earthquake, Recovery, and After.
    • Observed distinct changes in power and theta-gamma coupling during stage transitions.
    • Revealed contrasting connectivity dynamics between theta (separated-united-separated) and gamma (united-separated-united) bands, including alternations in strength and pattern.

    Conclusions:

    • The study provides a novel perspective on functional brain dynamics under fearful stimuli.
    • Demonstrated distinct temporal dynamics of whole-brain connectivity in theta and gamma bands during fear.
    • Highlighted the relationship between dynamic functional connectivity and the brain's structural substrates during fear processing.