Journal article

Creating virtual electrodes with 2D current steering

Thomas C Spencer, James B Fallon, Mohit N Shivdasani



OBJECTIVE: 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. APPROACH: Normally-sighted eyes of seven adult anaesthetised cats were implanted with a 42-channel electrode array in the suprach..

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Awarded by National Health and Medical Research Council (NHMRC)

Funding Acknowledgements

The authors wish to thank Stephanie Epp, Ceara McGowan, Ali Almasi, Felix Aplin, Kerry Halupka, Faith Lamont, Rodney Millard, Alison Neil, Alexia Saunders, Evgeni Sergeev, Dimitra Stathopoulos, Patrick Thien, and Sam Titchener for assistance. Also, thanks to Penny Allen and Chi Luu for implanting the suprachoroidal device. Funding for this research was provided by the National Health and Medical Research Council (NHMRC) Project Grant #1063093 and the Bart Reardon PhD Scholarship. The Bionics Institute acknowledges the support it receives from the Victorian Government through its Operational Infrastructure Support Program.