A Landolt C target and letter X nontarget were dichoptically presented to 8 subjects. The nontarget presented to one eye foveally or peripherally flanked the area of the parafovea corresponding to that receiving the target in the other eye. Identification of the orientation of the C was poorer with the nontarget in the peripheral position. If, as has been proposed previously, asymmetric lateral inhibition is responsible for the phenomenon, its locus would seem to lie beyond the retina.
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