Abstract
Summary The role of variations of visual angle (from 0° to 80°) on comparative judgments of numerosity with simultaneous presentation of red and green lights was studied. Subjects'performance may be summarized by two statements : a) accuracy decreases from 0° to 30° ; b) there is a bias (green is overestimated) which is higher between 30° and 50°. These observations can be explained by reference to some retinal properties. The general decay in performance with increase in visual angle results from decreased acuity moving from the fovea to the periphery (temporal distal periphery). Furthermore, the retina achromatic sensitivity from 50° to 80° seems to be responsible for the phenomenon of green overestimation. Response-time analysis provides further confirmations of these explanations.
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