SENSORY STIMULUS FOR DISJUNCTIVE EYE MOVEMENTS

To study the central mechanisms that compare and correlate information coming in from the two eyes, the limits of the stimulus situations were mapped within which horizontal eye vergence movement are initiated in human observers. Disparate visual configurations may be quite dissimilar in shape and contrast in the two eyes and may even be separated by about 100 msec in time and several degrees in the vertical direction and yet elicit normal horizontal vergence movements. In a subject with midline section of the cerebral commissures, presentation of a visual stimulus in which disparity alone is the cue for vergence is followed by convergence movements only when both disparate stimuli go to one cerebral hemisphere. © 1969.