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Updated: Sep 13, 2025

Evaluation of Hemisphere Lateralization with Bilateral Local Field Potential Recording in Secondary Motor Cortex of Mice
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Hemispheric Complementarity in Hippocampal Theta Dynamics during Mnemonic Decision-Making.

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    This study reveals how hippocampal theta oscillations guide memory decisions. Left hippocampal theta promotes novelty detection, while right theta helps avoid false familiarity, aiding accurate memory discrimination.

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    Area of Science:

    • Neuroscience
    • Cognitive Science
    • Computational Neuroscience

    Background:

    • Episodic memory distinguishes similar experiences via pattern separation.
    • Hippocampal subfields are key, but temporal dynamics and decision influence are less understood.

    Purpose of the Study:

    • Investigate the role of hippocampal theta oscillations in evidence accumulation during mnemonic discrimination.
    • Examine how these neural dynamics influence memory-based decisions.

    Main Methods:

    • Source-localized magnetoencephalography (MEG) and computational modeling (Linear Ballistic Accumulator).
    • Mnemonic Similarity Task to assess memory classification (repeat, lure, foil images).
    • Analysis of trial-by-trial drift rates and hippocampal theta power.

    Main Results:

    • Left hippocampal theta positively correlated with drift toward 'new' responses, indicating a novelty bias.
    • Right hippocampal theta negatively correlated with drift toward false alarms, suggesting a mechanism to reduce familiarity-based errors.
    • Bilateral hippocampal theta positively associated with drift during correct 'similar' responses, showing coordinated discrimination.

    Conclusions:

    • Hippocampal theta oscillations provide a dynamic, lateralized mechanism for real-time memory-guided decision-making.
    • Findings offer new insights into resolving mnemonic uncertainty and the temporal unfolding of memory computations.