All of this raises a couple of questions. First, where in the brain are these attentional modulations of the EEG signal coming from? Second, given that the EEG is abnormal even at long inter-target intervals, when behaviour is intact, what compensatory processes might be filling in for dysfunctional early attentional processing?

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`fMRI Evidence for Generalised Arousal as a Substitute for Early Selection in Autism during Conditions of Shifting Visual Spatial Attention', Matthew Belmonte, 10 November 2001