Fig. (2) Wide-field natural scene stimuli. (A) Creating stimuli for polar angle mapping. A frame is scaled to and masked by a rotating wedge. The picture (by R.-S.H.) is replaced by continuous video during fMRI experiments. (B) Example of resulting polar-angle stimuli. (C) Creating stimuli for eccentricity mapping. A frame is scaled to the outer perimeter and masked by an expanding ring. (D) Example of resulting eccentricity stimuli. (E) Time course of visible range (VR) of the expanding ring. Horizontal dashed lines indicate the extent of stimuli (~2°–40.7°). The vertical line indicates the time when the ring reaches the maximum eccentricity and starts to disappear.