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A multi-channel, flex-rigid ECoG microelectrode array for visual cortical interfacing.

Elena Tolstosheeva1, Víctor Gordillo-González2, Volker Biefeld3

  • 1Institute for Microsensors, Actuators and Systems (IMSAS), Microsystems Center Bremen (MCB), University of Bremen, Bremen 28359, Germany. et@imsas.uni-bremen.de.

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|January 9, 2015
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Summary
This summary is machine-generated.

This study introduces a novel high-density microelectrode array for brain-computer interfaces, demonstrating high-resolution electrocorticography recordings in non-human primates. The new array design shows promise for advanced neural signal acquisition.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Materials Science

Background:

  • High-density microelectrode arrays are crucial for brain-computer interfaces (BCIs).
  • Existing technologies face limitations in spatial resolution and integration.
  • Paralyzed individuals could benefit from advanced BCIs for communication.

Purpose of the Study:

  • To develop and characterize a novel multi-channel microelectrode array for high-resolution electrocorticography (ECoG) recordings.
  • To evaluate the performance of the array in an animal model for BCI applications.

Main Methods:

  • Fabrication of a 150 mm2 microelectrode array with 124 electrodes (100, 300, 500 µm diameter) and a skull-facing reference electrode.
  • Electrochemical characterization to determine impedance spectral bands.
  • Epidural recordings from the primary visual cortex of an awake Rhesus macaque.

Main Results:

  • Distinct impedance spectral bands were observed for different electrode sizes and the reference electrode.
  • Natural electrophysiological signals and clear visual responses were recorded.
  • Larger electrodes showed greater gamma band power; the skull-facing reference improved gamma power spectral density compared to average referencing.

Conclusions:

  • The proposed microelectrode array enables high-resolution ECoG recording.
  • The array design facilitates monolithic integration for BCI systems.
  • The skull-facing reference electrode offers advantages for neural signal processing.