Task stimuli used in the experiment were single large, global letters (H or S) composed of several smaller local letters (H or S). The global letter and the local letters were either congruent (global H made up of local Hs and global S made up of local Ss) or incongruent (global H made up of local Ss and global Ss made up of local Hs). A red fixation dot was displayed at the center of the screen throughout each run.