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Related Experiment Video

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Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices
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Prefrontal neuronal assemblies temporally control fear behaviour.

Cyril Dejean, Julien Courtin, Nikolaos Karalis

    Nature
    |July 14, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Neural oscillations in the dorsal medial prefrontal cortex (dmPFC) coordinate neuronal assemblies for fear responses. This study reveals a phase-specific coding mechanism controlling the precise timing of fear behavior.

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    Area of Science:

    • Neuroscience
    • Computational Neuroscience
    • Behavioral Neuroscience

    Background:

    • Neuronal oscillations and cell assemblies are crucial for sensory and cognitive processing via precise spike timing.
    • The role of spike-time coding in emotional behavior, specifically fear, remains largely unexplored.
    • The dorsal medial prefrontal cortex (dmPFC) is critical for fear memory expression, utilizing spike-rate coding for threat cues.

    Purpose of the Study:

    • To investigate the role of spike-time coding and neuronal assemblies in the dmPFC for fear behavior.
    • To determine if neuronal oscillations in the dmPFC contribute to the precise timing of fear responses.

    Main Methods:

    • Single-unit and local field potential recordings in the dmPFC.
    • Optogenetic manipulation of dmPFC neuronal activity.
    • Analysis of neuronal assembly formation and oscillatory activity during fear behavior.

    Main Results:

    • Conditioned fear expression in the dmPFC is causally linked to the organization of neurons into functional assemblies.
    • A 4 Hz oscillation in the dmPFC correlates with the activation of neuronal assemblies during fear behavior.
    • Optogenetic inhibition during specific oscillation phases differentially affects fear responses, while promotion occurs during other phases.

    Conclusions:

    • Identified a novel phase-specific coding mechanism within the dmPFC that dynamically regulates neuronal assemblies.
    • This mechanism precisely controls the timing of fear responses, extending beyond simple spike-rate coding.
    • Findings highlight the importance of oscillatory dynamics in the dmPFC for the temporal control of emotional behavior.