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Neuropsychologia. 2009 Feb;47(3):942-8. doi: 10.1016/j.neuropsychologia.2008.12.015. Epub 2008 Dec 24.

Unilateral left prosopometamorphopsia: a neuropsychological case study.

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Neuropsychology Laboratory, Dept. of Psychology, Second University of Naples, Via Vivaldi 43, 81100 Caserta, Italy.


We describe a patient who suddenly developed prosopometamorphopsia after a childbirth; she claimed that the left half of well-known and unfamiliar faces looked distorted. Brain MR was normal, whereas SPECT showed hypoperfusion of the left infero-lateral occipital cortex. No visual recognition defects for objects or faces were present. In three matching tasks with half-faces (Experiment 1), chimeric faces (Experiment 2), or chimeric objects (Experiment 3), the patient was impaired only when she matched pairs of chimeric faces differing in their left half; the same results were obtained after 1 year. This is the first behavioural demonstration of selective chronic metamorphopsia for the left side of faces, and provides new insights for models of face processing.

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