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An in‐vivo paradigm for the evaluation of stimulating electrodes for use with a visual prosthesis
Author(s) -
Chowdhury Vivek,
Morley John W.,
Coroneo Minas T.
Publication year - 2004
Publication title -
anz journal of surgery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.426
H-Index - 70
eISSN - 1445-2197
pISSN - 1445-1433
DOI - 10.1111/j.1445-1433.2004.02983.x
Subject(s) - neurostimulation , visual prosthesis , electrode array , stimulation , medicine , multielectrode array , electrode , neuroscience , biomedical engineering , visual cortex , neuroprosthetics , microelectrode , psychology , physical medicine and rehabilitation , chemistry
Background: Electrical stimulation of the visual cortex with surface electrodes is able to elicit basic visual perceptions in blind patients. The development of a visual prosthesis for the blind will require an in‐vivo model for the optimization of cortical neurostimulation with multielectrode arrays. Methods: In anaesthetized cats a bilateral craniotomy was performed and the dura was removed to expose the cerebral cortex. A prototype stimulating electrode array was placed on a gyrus in one hemisphere, and the transcallosal evoked response (TER) to cortical stimulation by this electrode array was recorded at a homologueous region in the contralateral hemisphere. Results: The stimulating electrode array elicited TER of short latency (6.9 ms) in the contralateral hemisphere. Bipolar stimulation of adjacent electrodes on the array evoked similar TER regardless of the polarity of stimulation. Electrodes spread apart on the array caused higher amplitude TER than electrodes placed close together. Multielectrode stimulation evoked lower amplitude TER than bipolar stimulation. Conclusions: This transcallosal model of cortical neurostimulation is a useful method to evaluate electrode arrays and stimulation techniques in the development of a visual prosthesis.