In autism, in contrast, visual processing in the two hemispheres seems not to be modulated so independently:
when shifts occur close together in time, the EEG response to a demand to shift attention is much greater than normal, suggesting an unusually high level of arousal,
and is in the same direction in both hemispheres, suggesting an absence of attentional selection.

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`Physiological Studies of Attention in Autism: Implications for Autistic Cognition and Behaviour', Matthew Belmonte, 26 January 2002