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Multichannel surface recordings on the visual cortex: implications for a neuroprosthesis
journal contribution
posted on 2023-05-16, 23:17 authored by Chelvanayagam, DK, Vickery, RM, Matthew KirkcaldieMatthew Kirkcaldie, Coroneo, MT, Morley, JWUsing a multi-channel platinum surface electrode array, recordings from cat primary visual cortex were obtained in response to visual stimuli, and electrical stimuli delivered using the elements of the array itself. Neural responses to electrical stimuli were consistent, regardless of stimulus polarity or leading phase (biphasic), although thresholds were lower for monophasic than biphasic pulses. Both visual and electrical stimuli reliably evoked responses with characteristic components, which interacted with each other in a nonlinear summation showing first facilitation then suppression during the window of interaction. The chronaxie for eliciting threshold cortical responses was about 100 νs, and the charge density with a pulse width of 50-100 νs was around 55 νC cm-2. These data form the basis of understanding the types of cortical responses to stimuli delivered by devices suitable for chronic implantation. © 2008 IOP Publishing Ltd.
History
Publication title
Journal of Neural EngineeringVolume
5Pagination
125-132ISSN
1741-2560Department/School
Tasmanian School of MedicinePublisher
IOP PublishingPlace of publication
Bristol, EnglandRepository Status
- Restricted