A high-density, high-channel count, multiplexed μECoG array for auditory-cortex recordings.

Area of Science:

• Neuroscience
• Biomedical Engineering
• Signal Processing

Background:

• Understanding large-scale neural population dynamics is limited by current recording technologies.
• Simultaneous recording from extensive cortical regions remains a significant challenge.

Purpose of the Study:

• To validate a novel large-scale active microelectrode array for high-density neural recordings.
• To compare the efficacy of active versus passive micro-electrocorticography (μECoG) arrays for cortical mapping.
• To assess the potential of this technology for precise, large-scale cortical monitoring.

Main Methods:

• Developed and validated a custom active microelectrode array capable of recording 196 multiplexed μECoG signals at 1,600 electrodes/cm(2).
• Compared μECoG recordings from active arrays with passive arrays and intrinsic optical imaging in the auditory cortex.
• Generated spectrotemporal receptive fields from recorded neural activity.

Main Results:

• Active μECoG arrays provided more veridical representations of auditory cortex tonotopic organization than passive arrays.
• Efficient neural data acquisition was achieved with active arrays, requiring as little as 13.5 seconds.
• Functional organizational principles derived from active array data were comparable to intrinsic metabolic imaging and single-neuron recordings.

Conclusions:

• The validated active microelectrode array technology enables large-scale, high-density, and temporally precise cortical monitoring.
• This non-invasive technology offers significant potential for advancing brain mapping and understanding neural population dynamics.
• The findings suggest a new standard for high-resolution, large-scale neural activity recording.