Abstract
Studies have shown that there is an optimal size of element in a checkerboard pattern, used to stimulate the visual system, for eliciting the visual evoked cortical potential (VECP). This size of element is between 8 and 25 min of visual angle. Since most studies have not reported fixation or location of fixation on the pattern, this study was performed in which fixation was specified at a location which ensures a constant illumination of the fovea regardless of check size. The resulting function, VECP amplitude vs. check size, resembles previously obtained functions, indicating either that previous subjects were fixating or that fixation is not important for these results.
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Siegfried, J.B. The effects of checkerboard pattern check size on the VECP. Bull. Psychon. Soc. 6, 306–308 (1975). https://doi.org/10.3758/BF03336671
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DOI: https://doi.org/10.3758/BF03336671