D K Chelvanayagam et al 2008 J. Neural Eng. 5 125 doi:10.1088/1741-2560/5/2/003
D K Chelvanayagam1,2, R M Vickery1, M T K Kirkcaldie3, M T Coroneo4 and J W Morley1,2
Show affiliationsUsing 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 µs, and the charge density with a pulse width of 50–100 µs was around 55 µC cm−2. These data form the basis of understanding the types of cortical responses to stimuli delivered by devices suitable for chronic implantation.
87.80.-y Biophysical techniques (research methods)
42.66.Ew Physiology of eye; optic-nerve structure and function
87.19.R- Mechanical and electrical properties of tissues and organs
Instrumentation and measurement
Issue 2 (June 2008)
Received 13 December 2007, accepted for publication 7 March 2008
Published 1 April 2008
D K Chelvanayagam et al 2008 J. Neural Eng. 5 125
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