Evoked cortical responses to checkerboard patterns: effect of check-size as a function of retinal eccentricity.

Visually evoked cortical responses were obtained from 3 Ss as they viewed checkerboard patterned light flashes (checks subtended from 0–180′ of arc) presented to different areas of the retina in respect to the fovea (0–27.5° eccentricity). An inverted “U” —shaped function was obtained between response amplitude and check-size. The check-size which elicited the greatest amplitude responses depended on eccentricity of retinal stimulation: when the foveal area was stimulated, relatively small checks (subtending 15–30′ of arc) evoked the greatest amplitude responses; when progressively more peripheral areas of the retina were stimulated (up to 7.5° eccentricity), progressively larger check-sizes evoked the greatest amplitude responses (subtending up to 60′ of arc). Check-size had little effect on evoked responses when the retina was stimulated 12.5–27.5° from the fovea. The results were discussed in relationship to the assumed size of retinal receptive field centers at different eccentricities in animals and humans.

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