[Stereoscopic visual evoked potential elicited by static random dot stereogram].
Using 16.56' visual disparity stimulation produced by television random dot stereogram (TVRDS), we recorded visual evoked potentials (VEPs) elicited from 35 normal subjects with and without breaking their stereopsis and 28 stereoblind subjects. The results showed that a constant negative-positive wave complex was observed in 33 of 35 normal subjects; this negative-positive wave-complex disappeared when the stereopsis was artificially inhibited by a prism and in the stereoblind group, and no VEP wave was elicited in all of the stereoblind patients except in one with paralytic strabismus. The results revealed that under this condition the VEPs elicited by TVRDS were specific VEPs related to visual disparity stimulation and were stereoscopic ones. The TVRDS is an effective electro-physiological means to examine the stereopsis objectively and a new way to approach the occurrence and development of stereopsis.
Laboratory of Strabismus Amblyopia and Optometry, Qingdao Medical College.
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Hu
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Yang
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Li
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D003867:Depth Perception / Q000502:physiology*; D005074:Evoked Potentials, Visual; D006801:Humans; D008875:Middle Aged; D010468:Perceptual Disorders / Q000503:physiopathology*; D010775:Photic Stimulation