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Science 21 June 1985:
Vol. 228. no. 4706, pp. 1453 - 1454
DOI: 10.1126/science.4012303
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Articles

Science, Vol 228, Issue 4706, 1453-1454
Copyright © 1985 by American Association for the Advancement of Science

articles

Knowledge without awareness: an autonomic index of facial recognition by prosopagnosics

D Tranel and AR Damasio

Prosopagnosia, the inability to recognize visually the faces of familiar persons who continue to be normally recognized through other sensory channels, is caused by bilateral cerebral lesions involving the visual system. Two patients with prosopagnosia generated frequent and large electrodermal skin conductance responses to faces of persons they had previously known but were now unable to recognize. They did not generate such responses to unfamiliar faces. The results suggest that an early step of the physiological process of recognition is still taking place in these patients, without their awareness but with an autonomic index.


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