Figure 1. The main experiment comprised five different stimuli (a–e). a) Center (C, Ring1) alone, b) near surround (S_N, Ring2) alone c) far surround (S_F, Ring 5) alone d) center and near surround and e) center and far surround.

The contrast of stimuli in this figure is higher than in the actual stimuli (15%). f) Eccentricity of the borders of the rings. The functional localizer for eccentricity representation comprised all five rings in a multifocal design.