Evaluation of the Exact Moment of Random-dot Stereogram Cognition by EOG and its Process by EEG

Random-dot Stereogram (RDS) has been used for the research on neurophysiological mechanism of binocular vision and characteristic brain waves (VEP) evoked by three-dimensional perception were reported. However, in previous studies, because the RDS was presented to a subject rather passively with the aid of supportive devices, the VEP has been recorded at a short period by which the subject's perception of RDS and cognition of the embedded figure was not distinguishable. By contrast, we designed an experiment in which a subject was required to find out the embedded figure so that the moment of the perception of RDS appearance and the cognition of the embedded figure is distinguishable. We then estimated the moment of the cognition by EOG profiles and observed characteristic brain potentials by referring to that estimated moment.