Figure 1.

Schematic illustration and timeline of the sequence of events starting from the beginning of a block. Empty square placeholders were present in the left and the right upper quadrants (each square subtending 7° visual angle, centered at an eccentricity of 8.5° vertically and 6° horizontally) throughout the experiment in order to denote the locations where bilateral checkerboards could appear (8 × 8 checks each, 0.875° visual angle per check, with 2, 3, or 4 checks marked in red pseudorandomly for each checkerboard). Note along the timeline how functional image acquisition was interleaved with presentation of TMS bursts and bilateral visual displays, with the TMS bursts and bilateral displays coinciding.