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Behavioural Neurology
Volume 4 (1991), Issue 2, Pages 81-87

Delusional Misidentification Incident in a Right Hemisphere Stroke Patient

Andrew W. Young,1 Brenda M. Flude,2 and Andrew W. Ellis3

1Department of Psychology, University of Durham, Durham DH1 3LE, UK
2Department of Psychology, University of Lancaster, UK
3Department of Psychology, University of York, UK

Copyright © 1991 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We report a delusional misidentification incident lasting some hours in which a man who had suffered a right hemisphere stroke, HW, mistook a student for his daughter. Investigation of HW's face processing abilities showed unimpaired ability to recognize familiar faces and match facial expressions, but severe impairments of unfamiliar face matching both on the Benton test and a task requiring the matching of disguised and undisguised faces. The incident shows some similarity to the Frégoli delusion, which has also been noted following brain injury affecting the right cerebral hemisphere.