| Abstract | Single-letter targets, followed at varying onset-onset intervals by a patterned mask, were presented for identification to the hemiretinae of both eyes. The target and mask stimuli were spatially overlapping; the mask could impede target perception dichoptically, and the energy of the target stimuli was twice that of the mask. Under these conditions, U-shaped monoptic masking functions were obtained which did not differ, as a function of hemiretinae, in their overall shape or in their points of maximal masking. |