Real-time simulation of phosphene images evoked by electrical stimulation of the visual cortex

  • Fehervari T
  • Matsuoka M
  • Okuno H
 et al. 
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Abstract

Applying electrical stimulation to the visual cortex has been shown to produce dot-like visual perceptions called phosphenes. Artificial prosthetic vision is based on the concept that patterns of phosphenes can be used to convey visual information to blind patients. We designed a system that performs real-time simulation of phosphene perceptions evoked by cortical electrical stimulation. Phosphenes are displayed as Gaussian circular and ellipsoid spots on a randomised grid based on existing neurophysiological models of cortical retinotopy and magnification factor. The system consists of a silicon retina camera (analogue integrated vision sensor), desktop computer and headmounted display.

Author-supplied keywords

  • artificial vision
  • phosphene
  • silicon retina
  • simulation
  • visual cortex
  • visual prosthesis

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