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. Author manuscript; available in PMC: 2009 Dec 1.
Published in final edited form as: Brain Cogn. 2008 Oct 5;68(3):255–270. doi: 10.1016/j.bandc.2008.08.016

Figure 3.

Figure 3

Participants initially fixated on the central cross. After a brief interval, two peripheral checkerboards were presented. Each checkerboard oscillated on and off at a different frequency for about 5 sec in order to invoke a steady state response at that frequency that could be measured with dense-array EEG. Following this interval, one of the peripheral checkerboards doubled in luminance. Brain activity over visual cortex was measured during the flicker interval before target onset. Activity (EEG power) on pro-and anti-trials deviated after onset of the flickering stimuli but not before (see the lower right plot). From Clementz et al., 2008.