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Related Experiment Video

Updated: Jun 8, 2025

Surgical Training for the Implantation of Neocortical Microelectrode Arrays Using a Formaldehyde-fixed Human Cadaver Model
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Creating ionic current pathways: A non-implantation approach to achieving cortical electrical signals for

Yike Sun1, Yaxuan Gao1, Anruo Shen1

  • 1School of Biomedical Engineering, Tsinghua University, Beijing, 100084, China.

Biosensors & Bioelectronics
|November 1, 2024
PubMed
Summary

This study presents a new non-invasive method for brain signal acquisition using an artificial ionic current path (AICP). This technique achieves high-quality neural recordings comparable to invasive methods without surgical risks.

Keywords:
Artificial ionic current pathBrain-computer interfaceElectrocorticographyEvoked potentialsNeurophysiologyNon-invasive brain recording

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Signal Processing

Background:

  • Intracranial recordings offer high-fidelity brain signals but pose significant health risks.
  • Non-invasive methods often lack the necessary signal quality for detailed neurophysiological studies.
  • There is a need for safer, yet effective, brain signal acquisition techniques.

Purpose of the Study:

  • To introduce and validate a novel non-invasive method for acquiring brain electrical signals.
  • To establish an artificial ionic current path (AICP) for enhanced signal transmission.
  • To compare the signal quality of the AICP method with traditional invasive techniques.

Main Methods:

  • Development of a technique using ultrasonic tools to create micro-holes in the skull.
  • Insertion of hollow implants to prevent natural healing and establish an AICP.
  • Utilizing natural tissue fluid as a conduction medium for cortical signals.
  • Validation through synchronized recordings with perforated electrocorticography (ECoG) in pigs.

Main Results:

  • The AICP method achieved signal quality comparable to implanted ECoG in the low-frequency range.
  • A significant improvement in the signal-to-noise ratio for evoked potentials was observed.
  • Demonstrated the feasibility of acquiring high-quality brain signals non-invasively.
  • Validated the effectiveness of using tissue fluid as a natural conduction path.

Conclusions:

  • The novel AICP technique provides a safe and effective alternative to invasive brain signal acquisition.
  • This method holds significant potential for applications in neurophysiology, clinical research, and brain-computer interfaces.
  • The innovative use of natural tissue fluid opens new possibilities for brain signal analysis.