A-19. Visual evoked potentials: Basic technology and clinical applications

Visual information is processed simultaneously via multiple parallel channels and each channel constitutes a set of sequential processes. The visual evoked potentials (VEPs) are the evoked electrophysiological potential that can be extracted, using signal averaging, from the electroencephalographic activity recorded at the scalp. VEPs can provide important diagnostic information regarding the functional integrity of the visual pathways and the visual cortex. Commonly used visual stimuli are flashing lights or pattern reversal (checkerboards or gratings) on the TV monitor or video screen.

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