Visual evoked cortical potentials and electroretinogram by color coded pattern stimuli

Y. Shimada, K. Murayama

Research output: Contribution to journalArticlepeer-review


We developed a color coded pattern stimulus system with a color checkerboard, in which each checker changes in luminance under constant chromaticity. THis system was used to record visual evoked cortical potentials (VECPs) and electroretinogram (ERG). In normal subjects, the color coded pattern stimuli using red and green checkers suppressed VECPs that were clearly elicited by yellow checkers. When two colors were used as stimuli, the suppressing effect became more pronounced along with the degree of difference in color. Stimulation by red and green also suppressed ERG. These findings seemed to be related to the underlying mechanism for pattern VECP and ERG. Color discrimination would induce suppression of responses for luminance contrast. This suppression appears to be located in the retina. Retinal responses are affected by whether the field of stimulus is color coded or not. Pattern ERG is not just the sum of local on- and off responses. The human retina recognizes the color pattern, Pattern ERG is generated as a result of this action.

Original languageEnglish
Pages (from-to)879-882
Number of pages4
JournalJapanese Journal of Clinical Ophthalmology
Issue number5
Publication statusPublished - 1996
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ophthalmology


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