Phase boundaries as electrically induced phosphenes

Document Type

Article

Publication Date

1-1-2006

Abstract

A model is presented of experiments where electrical stimulation of the eye of human subjects results in the perception of evenly spaced lines, or phosphenes. The model is a two-dimensional grid of integrate-and-fire oscillators that captures the important experimental characteristics of line-creation when a sinusoidal current injection is used. The spatio-temporal behavior of the lines, once formed, is also reproduced. A reduced model consisting of an evolution/convolution equation on the real line is analyzed, and it is shown that stationary solutions with arbitrarily located discontinuities exist and are linearly stable. Traveling waves are numerically shown to exist when the coupling is both sufficiently strong and biased, which accounts for the movement of the lines in the experiments.

Identifier

79951511116 (Scopus)

Publication Title

SIAM Journal on Applied Dynamical Systems

External Full Text Location

https://doi.org/10.1137/050646469

e-ISSN

15360040

First Page

529

Last Page

551

Issue

4

Volume

5

Fund Ref

National Science Foundation

This document is currently not available here.

Share

COinS