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Single 5 μm diameter needle electrode block modules for unit recordings in vivo.

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  • 1Department of Electrical and Electric Information Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka Tempaku-cho, Toyohashi, 441-8580 Japan.

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Researchers developed novel, low-invasive silicon wire electrodes for stable single neuronal recordings. These electrodes enable detailed investigation of brain activity in cortical areas.

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Area of Science:

  • Neuroscience
  • Materials Science
  • Bioengineering

Background:

  • Stable single neuronal recording is crucial for understanding cortical area mechanisms.
  • Existing methods can be invasive and lack long-term stability.

Purpose of the Study:

  • To fabricate and evaluate fine silicon wire electrodes for improved in vivo neuronal recording.
  • To reduce invasiveness and enhance stability in electrophysiological measurements.

Main Methods:

  • Vapor-liquid-solid (VLS) growth was used to create 3 μm diameter, 160 μm length silicon wire electrodes.
  • Electrodes were mounted on modular conductive silicon blocks for flexible device packaging (e.g., PCBs).
  • Platinum black plating achieved low electrical impedance (~100 kΩ at 1 kHz).

Main Results:

  • In vivo recordings in mice demonstrated stable detection of spike signals (200-300 μV amplitude).
  • Single-unit activities were successfully recorded in cortical layer 2/3.
  • Flexible PCB-packaged devices maintained stable unit recordings for over 98 minutes.

Conclusions:

  • Modular, low-invasive needle electrode blocks offer an effective method for in vivo single-unit recordings.
  • The adaptable device design supports diverse experimental applications in neuroscience.
  • This technology advances the capability for detailed neural circuit analysis.