Creating virtual electrodes with 2D current steering

Journal of Neural Engineering
Thomas C SpencerMohit N Shivdasani

Abstract

Current steering techniques have shown promise in retinal prostheses as a way to increase the number of distinct percepts elicitable without increasing the number of implanted electrodes. Previously, it has been shown that 'virtual' electrodes can be created between simultaneously stimulated electrode pairs, producing unique cortical response patterns. This study investigated whether virtual electrodes could be created using 2D current steering, and whether these virtual electrodes can produce cortical responses with predictable spatial characteristics. Normally-sighted eyes of seven adult anaesthetised cats were implanted with a 42-channel electrode array in the suprachoroidal space and multi-unit neural activity was recorded from the visual cortex. Stimuli were delivered to individual physical electrodes, or electrodes grouped into triangular, rectangular, and hexagonal arrangements. Varying proportions of charge were applied to each electrode in a group to 'steer' current and create virtual electrodes. The centroids of cortical responses to stimulation of virtual electrodes were compared to those evoked by stimulation of single physical electrodes. Responses to stimulation of groups of up to six electrodes with equal ratios ...Continue Reading

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Citations

Dec 14, 2018·Journal of Neural Engineering·Martin J SpencerAnthony N Burkitt
Sep 28, 2018·Journal of Neural Engineering·D L RathbunZ Hosseinzadeh
May 28, 2020·Micromachines·Shinyong ShimSung June Kim
Jul 14, 2020·Journal of Neural Engineering·Mohit N ShivdasaniRobert K Shepherd
Oct 23, 2020·Journal of Neural Engineering·Nishal P Shah, E J Chichilnisky
Nov 14, 2021·Brain Structure & Function·Sabrina J Meikle, Yan T Wong

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