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Related Experiment Video

Updated: Jan 8, 2026

Multiscale Investigations of Cortical Processing by Integrating Laminar Polytrodes and Optogenetics with Micro Electrocorticography in Rodents
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Fiber-Less, Large-Scale Opto-Electrophysiology Interface for Micro-Scale Interaction of Multiple Brain Regions.

Sungjin Oh, Jose Roberto Lopez Ruiz, Kanghwan Kim

    IEEE Transactions on Bio-Medical Engineering
    |December 19, 2025
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a novel integrated headstage for simultaneous neural recording and optogenetic stimulation, enabling high-resolution brain network analysis. The system achieves unprecedented channel density for advanced neuroscience research.

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    Area of Science:

    • Neuroscience
    • Biomedical Engineering
    • Optoelectronics

    Background:

    • Understanding complex brain networks requires high spatiotemporal resolution tools for simultaneous neural recording and stimulation.
    • Existing technologies like CMOS probes have limitations in micro-scale interaction and stimulation capability.
    • Optogenetics offers neuron-specific stimulation but conventional methods cause unspecific perturbations due to large illumination volumes.

    Purpose of the Study:

    • To develop a fully integrated headstage combining micro-LED optoelectrodes, CMOS IC, and flexible interposer for miniaturized implementation.
    • To enable micro-scale, bidirectional interaction with neurons at high spatiotemporal precision.
    • To advance optogenetics by providing localized stimulation and recording across multiple brain regions.

    Main Methods:

    • Advanced micromachining techniques to integrate recording electrodes and micro-light-emitting diodes (μLEDs).
    • Micro-second, independent 384-channel interaction enabled by a low-power, area-efficient circuit.
    • Compact and reliable hybrid assembly using a polyimide-cable-based system.

    Main Results:

    • A compact and lightweight headstage (23.8×28.8 mm², 3.5g) achieved the highest reported channel density (0.56 channels/mm²).
    • Demonstrated in vivo feasibility in a transgenic mouse, identifying >160 neurons.
    • Showcased local and broad-range effects from focal optogenetic stimulation.

    Conclusions:

    • Successfully implemented a hybrid integrated, large-scale opto-electrophysiology interface prototype.
    • Verified the system's feasibility in vivo, representing a significant advancement in neural interface technology.
    • This fully integrated platform extends previous μLED-based probe capabilities into a complete, high-performance system.