Perception of faces by patients with localized cortical excisions.

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Abstract
Patients with various unilateral lesions and normal subjects were given a face-perception task. Two composite symmetrical faces were made by combining the left or right half of a normal face with its corresponding mirror image, the subject indicating which composite more closely resembled the original face. Regardless of upright or inverted orientation, normal subjects and patients with left-hemisphere lesions exhibited a preference for the left-visual-field composite. Patients with right posterior lesions failed to show a bias in either orientation. Right temporal and parieto-occipital cortex appear to contribute to facial perception, regardless of orientation.