Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Progress in Developing a Neuromorphic Device that is Predicted to Enhance Cortical Prosthetic Vision by Enabling the Formation of Multiple Visual Geometries

Version 1 : Received: 30 June 2022 / Approved: 1 July 2022 / Online: 1 July 2022 (17:01:32 CEST)

How to cite: Pavloski, R. Progress in Developing a Neuromorphic Device that is Predicted to Enhance Cortical Prosthetic Vision by Enabling the Formation of Multiple Visual Geometries. Preprints 2022, 2022070021 (doi: 10.20944/preprints202207.0021.v1). Pavloski, R. Progress in Developing a Neuromorphic Device that is Predicted to Enhance Cortical Prosthetic Vision by Enabling the Formation of Multiple Visual Geometries. Preprints 2022, 2022070021 (doi: 10.20944/preprints202207.0021.v1).

Abstract

Sense element engagement theory explains how neural networks produce cortical prosthetic vision. A major prediction of the theory can be tested by developing a device which is expected to enable perception of continuous forms in altered visual geometries. The research reported here completes several essential steps in developing this device: (1) replication of simulations that are consistent with the theory using the NEST simulator, which can also be used for full-scale network emulation by a neuromorphic computer; (2) testing whether results consistent with the theory survive increasing the scale and duration of simulations; (3) establishing a method that uses numbers of spikes produced by network neurons to report the number of phosphenes produced by cortical stimulation; and (4) simulating essential functions of the prosthetic device. NEST simulations replicated early results and increasing their scale and duration produced results consistent with the theory. A decision function created using multinomial logistic regression correctly classified the expected number of phosphenes for 2080 spike number distributions for each of three sets of data, half of which arise from simulations expected to yield continuous visual forms on an altered visual geometry. A process for modulating electrical stimulation amplitude based on intermittent population recordings that is predicted to produce continuous visual forms was successfully simulated. The classification function developed using logistic regression will be used to tune this process as the scale of simulations is further increased.

Keywords

artificial neural networks; biological neural networks; cortical prosthetic vision; machine vision; neuromorphic hardware; neuroprosthesis

Subject

LIFE SCIENCES, Biotechnology

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