Figure 2.

(a) Uniform gratings of two different orientations (both 45° from the vertical) were used as stimuli for the main experiment. (b) The seven stimuli were presented in a randomized block order during localizer scans. Stimuli 1 and 2 were used to isolate regions with no radial bias; Stimuli 3 and 4 were used to isolate regions with radial bias; and Stimuli 5–7 were used to segment V1. (c) An illustration of the timecourse of stimuli presentation for the main experiment. The two 16 s stimulus blocks (one for each orientation) were repeated four times each for a total of eight stimulus blocks per subrun. The entire subrun was repeated four times for each scan, with a gap of 24 s fixation between subruns to minimize the dependency between subruns