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Related Experiment Video

Updated: Sep 4, 2025

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice
07:33

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice

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A Control-Theoretical System for Modulating Hippocampal Gamma Oscillations Using Stimulation of the Posterior

Carlos E Davila, David X Wang, Maxwell Ritzer

    IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
    |July 18, 2022
    PubMed
    Summary

    This study demonstrates a novel closed-loop system for modulating brain signals, specifically hippocampal gamma power, to potentially restore episodic memory. The developed controller shows promise for safe and effective in-vivo application.

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    Related Experiment Videos

    Last Updated: Sep 4, 2025

    Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice
    07:33

    Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice

    Published on: June 29, 2018

    11.9K
    Generation of Local CA1 γ Oscillations by Tetanic Stimulation
    08:02

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    Published on: August 14, 2015

    9.2K
    Recording Spatially Restricted Oscillations in the Hippocampus of Behaving Mice
    07:10

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    Area of Science:

    • Neuroscience
    • Biomedical Engineering
    • Control Theory

    Background:

    • Closed-loop stimulation offers targeted brain signal modulation for conditions like memory loss.
    • Hippocampal gamma power is a key biomarker for episodic memory processing.

    Purpose of the Study:

    • To apply control theory for closed-loop modulation of hippocampal oscillatory activity.
    • To develop and evaluate a linear quadratic integral (LQI) servo-controller for hippocampal gamma power.

    Main Methods:

    • Utilized a dataset from open-loop stimulation of the posterior cingulate cortex with recorded hippocampal gamma power.
    • Designed and simulated an LQI servo-controller based on an autoregressive with exogenous input (ARX) model.
    • Evaluated controller performance for in-vivo viability.

    Main Results:

    • The LQI controller effectively modulated hippocampal gamma power in 15 out of 17 subjects.
    • Achieved modulation within physiologically safe stimulation thresholds and clinically relevant time scales.
    • Demonstrated the viability of the closed-loop system for potential clinical application.

    Conclusions:

    • The developed LQI servo-controller is a viable tool for closed-loop modulation of hippocampal gamma power.
    • This approach shows potential for episodic memory restoration and other neurological applications.
    • Further in-vivo experimentation is warranted to validate and refine the system.