Asymmetrical evoked potentials in response to face stimuli.

Evoked potentials were recorded from temporal, parietal and occipital regions in normal right-handed controls during presentation of known and unknown faces, geometric designs and pattern reversal. The results show a significant right greater than left amplitude asymmetry of P300 for face stimuli but not for geometric designs or pattern reversal. P100 showed no such asymmetry. The results provide physiological evidence to suggest that there is an interhemispheric difference in the processing of faces.