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Graphene-Integrated Ultrathin Neural Probe for Multiregional Cortical Recordings.

Young-Woo Pyo1, Heegeun Kim1, Hong-Gyu Park1

  • 1Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 08826, Republic of Korea.

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Summary

Researchers developed the large-area NeuroWeb (LNW), a novel neural probe for extensive brain recording. This minimally invasive device enables stable, high-quality neural activity mapping across multiple regions for up to seven days.

Keywords:
2D materialsbidirectional neural interfacemultiregional cortical recordingsurface electrophysiologyultrathin neural probe

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Materials Science

Background:

  • Electrophysiological techniques are crucial for nervous system research.
  • Current noninvasive neural probes have limited spatial coverage.
  • Capturing complex neural interactions across brain regions remains challenging.

Purpose of the Study:

  • To introduce the large-area NeuroWeb (LNW), an ultrathin neural probe for extensive cortical recording and stimulation.
  • To evaluate the LNW's performance for stable, high-resolution neural activity mapping.
  • To demonstrate the LNW's capability for region-specific neural signal acquisition and activation.

Main Methods:

  • Development of the LNW probe with four 16-channel platinum electrode arrays interconnected by graphene networks.
  • In vivo implantation and recording in mouse brains.
  • Whisker and electrical stimulation to assess neural response and activation.

Main Results:

  • The LNW achieved stable, high-quality single-unit spike recordings for up to 7 days post-surgery.
  • Simultaneous high-resolution neural activity recordings were obtained across the somatosensory cortex and cerebellum.
  • Precise and bidirectional neural connections were confirmed for region-specific signal acquisition and activation.

Conclusions:

  • The LNW probe facilitates comprehensive and accurate mapping of neuronal dynamics.
  • This technology simplifies experimental procedures by reducing the need for multiple probes.
  • The LNW shows potential for advancing brain-machine interfaces and neural prostheses.