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PURPOSE. We investigated the effects of image contrast, stimulus density, and viewing distance upon a multifocal steady-state visual evoked potential (MSV) method. METHODS. Fourteen adults with normal vision (mean age ¼ 27.0 6 6.6 years; 6 males) participated in the study. Each of the stimulus regions of the multifocal ensembles presented a contrast modulated grating, displaying spatial and temporal frequencies that evoke the spatial frequency doubling illusion. All subjects were tested at fivedoi:10.1167/iovs.11-9325 pmid:22786904 fatcat:bj2icr2akrg6liyhg76hygoo2y