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. Author manuscript; available in PMC: 2014 Apr 21.
Published in final edited form as: Vision Res. 2009 Aug 11;49(20):2509–2517. doi: 10.1016/j.visres.2009.08.007

Figure 1.

Figure 1

Schematic illustration of the stimuli. A random-dot kinematogram was used. A full cycle of the stimulus consisted of 0.6 s of circular coherent motion (clockwise) followed by 0.6 s of incoherent motion, followed by 0.6 s of anticlockwise motion, followed by 0.6 s of incoherent motion. The position of individual dots was shifted over a fixed spatial displacement at each temporal update in both coherent and incoherent phases of the display. VEP responses were measured over a wide range of dot displacements (Δx) at three dot-update frequencies (1/Δt's of 15, 20 and 30 Hz).