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. Author manuscript; available in PMC: 2016 Jan 31.
Published in final edited form as: Neuropsychologia. 2015 Jan 7;68:82–93. doi: 10.1016/j.neuropsychologia.2015.01.003

Figure 2.

Figure 2

Schematic illustration of the global direction discrimination task performed during acquisition of Visual Evoked Potentials (VEPs). On each trial, after a random inter-trial interval of 1–2 s, a fixation cross appeared in the center of the computer screen for 1 s, followed by a cloud of stationary random dots presented inside a 5 deg diameter window in one of the 4 visual field quadrants. After an interval that varied randomly between 1–2 s, the dots began to move either to the right or the left for 500 ms. Subjects were asked to indicate direction of motion of the stimulus as soon as possible (Respond ASAP).