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A Schematic layout of the stimuli. Participants viewed a fixation cross while a small and a large circle were presented on the left and right of fixation. B The timing diagram of a synesthetically congruent trial at an audiovisual interval of 150 ms. C Schematic representation of the congruent and incongruent audiovisual combinations. L, low-tone sound; H, high-tone sound; B, big circle; S, small circle
