Abstract
Majority of studies that investigated attentional modulation of the visual evoked potential (VEP) have been confined to the transient responses evoked by isolated stimuli. The steady-state visual evoked potential (SSVEP) offers certain advantages. Its signal is easily recorded and quantified and can be rapidly extracted from background noise. Its amplitude to a continuous irrelevant background flicker is attenuated over prefrontal, central, and right parietotemporal regions in the interval following a cue to change the card-sort criterion. Paying attention to a specific region of the visual field is associated with increased amplitudes to stimuli flashed at the attended location. Spatial attention strongly increases the amplitude of the steady-state visual evoked potential. Its phase depends on the transmission time between the stimulus and the evoked brain activity but does not give a direct measure of this transmission time. The pathway originates predominately in the foveal region of the retina from ganglion. This chapter concludes that the SSVEP provides a sensitive measure of spatial attention processes and offers certain advantages over the transient VEP.
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