A novel interface for cortical columnar neuromodulation with multipoint infrared neural stimulation

Area of Science:

• Neuroscience
• Biomedical Engineering
• Ophthalmology

Background:

• Electrical visual cortical prosthetics show promise for vision restoration.
• Current methods face challenges in achieving precise neural interface.

Purpose of the Study:

• To present an alternative optical approach for visual prosthetics using infrared neural stimulation.
• To investigate the feasibility of interfacing with dense arrays of cortical columns with high spatial precision.

Main Methods:

• Devised linear array and 100-fiber bundle array optical fiber interfaces.
• Delivered pulsed infrared neural stimulation in anesthetized cat visual cortex.
• Monitored effects using optical imaging in the contralateral visual cortex.

Main Results:

• Infrared neural stimulation modulated responses to visual gratings.
• Enhanced responses in orientation-matched domains and suppressed responses in non-matched domains were observed.
• Results suggest higher-order integration mediated by callosal inputs.

Conclusions:

• Pulsed infrared neural stimulation provides a novel optical approach for visual prosthetics.
• This method offers precise targeting of visual cortical columns.
• It lays the groundwork for a new type of visual prosthetic device.