High-density mapping of primate digit representations with a 1152-channelµECoG array

Area of Science:

• Neuroscience
• Biomedical Engineering
• Medical Devices

Background:

• Brain-machine interfaces (BMIs) show promise for treating movement disorders.
• Electrocorticogram (ECoG) is a feasible signal source for clinical BMIs, but current electrode density is limited.
• Higher-density electrode arrays are needed for more precise neural activity capture.

Purpose of the Study:

• To develop a high-density ECoG recording system with large coverage.
• To overcome the limitations of current electrode counts in ECoG arrays.
• To enhance neural signal resolution for next-generation brain-sensing technology.

Main Methods:

• Developed a novel high-density recording system integrating flexible arrays with neural-recording application-specific integrated circuits.
• Utilized a system with 1152 electrodes over a 14 × 7 mm² area.
• Conducted comparative experiments using 128-channel arrays and subsampling analysis.

Main Results:

• The proposed 1152-electrode system successfully delineated the entire digit representation in a nonhuman primate.
• Comparative experiments confirmed the device's capability.
• Subsampling analysis indicated that higher-density arrays yield higher-amplitude signals.

Conclusions:

• The developed high-density ECoG system offers large-scale sampling and high spatial resolution.
• This technology is suitable for next-generation brain-sensing applications.
• The system provides high temporal precision comparable to optical imaging.