Abstract
Visual reaction times (RTs) were measured using two trained, right-handed subjects with normal vision. A target was presented to 11 retinal loci: fovea; and 10°, 20°, 40° and 50° on both the nasal and the temporal sides of the fovea along the horizontal meridian of the right eye. Stimulus luminance was fixed at 8.50 cd/m 2. RT measured on the basis of a right-hand response increased as a function of retinal eccentricity from the fovea. Moreover, RT to stimulation on the nasal side of the retina was significantly faster than RT to stimulation on the temporal side at any corresponding retinal locations. Furthermore, the data suggested that the mean naso-temporal difference in RT increased as a function of the distance from the fovea. It was hypothesized that inter-hemispheric transmission time may be a major determinant of naso-temporal differences in RT.
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