Patent ID: 8244364
Filing Date: 2012-08-14
Classification: A61N

Abstract:
1. A method for determining visual perceptual threshold, comprising: exposing subjects to a series of variable current stimuli, each stimuli including a pulse train of biphaic pulses; decreasing a cathodic amplitude of the variable current stimuli if a subject answers correctly to a current stimulus; increasing a cathodic amplitude of the current stimuli if a subject answers incorrectly to the current stimulus; generating a psychometric function based on answers of the subject relative to the cathodic amplitude, to determine threshold, wherein a yes-no paradigm is used, and half of the series of variable current stimuli contained no stimulus; and stimulating visual neurons according to the psychometric function, said threshold and a video input to create the perception of light; and determining how visual perception depends on the generated stimulation pattern by applying a leaky integrator model, said leaky integrator model being based on a stimulus energy with time constants less than 1 ms.