Figure 1.

Stimuli. (A) High-contrast spiral pattern (dominant stimulus). (B) Low-contrast radial pattern (target stimulus). (C) Contrast increment in the upper left quadrant of the target stimulus. The induced wave that propagates along the shorter section between trigger and arrival point (black lines) travels along the interhemispheric path. (D) Contrast increment in the lower right quadrant of the target stimulus. The induced wave that propagates along the shorter section between trigger and arrival point travels along the intrahemispheric path.