Neurophysiological responses to face, facial regions and objects in adults with Asperger's syndrome: an ERP investigation.

Face processing differences have been observed between AS and control subjects at the behavioural and neurological levels. The purpose of the present study was to investigate the neurophysiological basis of processing faces and facial features (eyes and mouths) in adults with AS relative to age- and gender-matched typically-developing controls. These results were compared with ERPs generated to objects in both groups to determine if any differences were specific to facial stimuli. Although both groups elicited earlier N170 latencies to faces than to face parts and to eyes relative to mouths, adults with AS exhibited delayed N170 latencies to faces and face parts relative to controls. This difference was not observed to objects. Together these findings suggest that adults with AS may be slower to process facial information.