Fig. 1.

Functional magnetic resonance imaging (fMRI) methods. A: example of the stimulus (upper visual field, radial, and middle-present condition). B: illustration of 4 stimulus conditions: flankers were arranged either radially or tangentially with respect to the fovea; the middle letter was either present or absent. C: schematic diagram of the block design. Note that the fixation change (to dark-colored square) also occurred with the same timing schedule during the fixation-only blocks where the letter stimulus was absent. Regardless of block type, subjects were asked to identify the color of the square at fixation.