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Evaluation of microelectrode materials for direct-current electrocorticography.

Chunyan Li1, Raj K Narayan, Pei-Ming Wu

  • 1Cushing Neuromonitoring Laboratory, Feinstein Institute for Medical Research, Manhasset, NY 11030, USA. Department of Neurosurgery, Hofstra North Shore-LIJ School of Medicine, Hempstead, NY 11549, USA.

Journal of Neural Engineering
|December 15, 2015
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Summary

Iridium oxide microelectrodes show superior performance for direct-current electrocorticography (DC-ECoG) recordings, offering excellent stability and suitability for multimodal monitoring. This research provides crucial data for developing advanced neural recording technologies.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Materials Science

Background:

  • Direct-current electrocorticography (DC-ECoG) offers superior brain state characterization compared to traditional AC-ECoG.
  • Challenges in DC-ECoG include electrode polarization, potential drift, and increased impedance with smaller electrode sizes.
  • Limited research exists on microelectrode properties specifically for DC-ECoG applications.

Purpose of the Study:

  • To investigate the suitability of common microelectrode materials for DC-ECoG.
  • To evaluate electrode polarization impedance, AC current-induced polarization, long-term stability, and low-frequency noise.
  • To identify optimal materials for reliable DC-ECoG recordings.

Main Methods:

  • Investigated gold, Ag/AgCl, platinum, Iridium oxide (IrOx), and platinum-iridium oxide (Pt/IrOx) microelectrodes (300 μm diameter) in vitro (0.9% saline).
  • Assessed critical electrical characteristics including polarization impedance and stability.
  • Further evaluated promising materials (Pt and Pt/IrOx) in vivo by recording spreading depolarization waves.

Main Results:

  • IrOx-based microelectrodes, especially with nanostructured composite layers, demonstrated excellent performance in vitro and in vivo.
  • Pt electrodes exhibited high current-induced polarization but acceptable long-term stability for DC-ECoG.
  • Quantitative data on microelectrode electrical properties for low-frequency neural recordings were obtained.

Conclusions:

  • IrOx-based microelectrodes are highly suitable for DC-ECoG and multimodal monitoring applications.
  • Pt electrodes offer acceptable performance for DC-ECoG despite polarization challenges.
  • The study provides valuable data for the advancement of neural recording technologies, particularly for low-frequency signals.