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Brain Mapping Using a Graphene Electrode Array
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A Compact Closed-Loop Optogenetics System Based on Artifact-Free Transparent Graphene Electrodes.

Xin Liu1, Yichen Lu1, Ege Iseri1

  • 1Neuroelectronics Group, Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, CA, United States.

Frontiers in Neuroscience
|March 22, 2018
PubMed
Summary

Transparent graphene micro-electrodes overcome light-induced artifacts in electrophysiology. This enables compact, closed-loop optogenetics systems for precise neural circuit investigation.

Keywords:
closed-loop optogeneticselectrophysiologygraphenelight-induced artifactmulti-electrode arrayneural recordingsoptogeneticstransparent graphene array

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Area of Science:

  • Neuroscience
  • Bioengineering
  • Materials Science

Background:

  • Electrophysiology monitors neural activity, while optogenetics enables precise neural control.
  • Combining these techniques is vital for understanding neural circuit function.
  • Light stimulation in optogenetics causes electrical artifacts that interfere with electrophysiological recordings.

Purpose of the Study:

  • To develop artifact-free electrophysiological recordings during optogenetic stimulation.
  • To create a compact, closed-loop system integrating optogenetics and electrophysiology.
  • To investigate the efficacy of transparent graphene micro-electrodes for this purpose.

Main Methods:

  • Fabrication of transparent graphene micro-electrodes on polyethylene terephthalate film.
  • Characterization and comparison of light-induced artifacts between graphene and metal electrodes.
  • Design and implementation of a compact, battery-powered closed-loop optogenetics system with optical stimulation module.

Main Results:

  • Graphene micro-electrodes significantly reduced or eliminated light-induced artifacts compared to metal electrodes.
  • The developed closed-loop system successfully integrated artifact-free electrophysiological recordings with optogenetic stimulation.
  • The system demonstrated reliable performance across various neural recording frequencies.

Conclusions:

  • Transparent graphene micro-electrodes are a promising solution for artifact-free optogenetic-electrophysiology integration.
  • The developed compact closed-loop system facilitates advanced neuroscience research.
  • This technology opens new avenues for studying neural circuits and developing brain-computer interfaces.