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Brain, Vol. 122, No. 2, 339-350, February 1999
© 1999 Oxford University Press

Selective horizontal dysmetropsia following prestriate lesion

Francesca Frassinetti1, Paolo Nichelli1 and Giuseppe di Pellegrino2

1 Dipartimento di Patologia Neuropsicosensoriale, Università di Modena, 2 Dipartimento di Psicologia, Università di Bologna, Italy

Correspondence to: Paolo Nichelli, MD, Dipartimento di Patologia Neuropsicosensoriale, Sezione di Neurologia, Università degli Studi di Modena, Largo del Pozzo 71, 41100 Modena, Italy. E-mail: nichelli{at}unimo.it

We describe a patient (P.S.) who, following a right prestriate lesion, reported that objects in the left visual field appeared distorted and smaller than those on the right. Other aspects of visual processing were remarkably unaffected. We carried out a series of size comparison tests using simple or complex stimuli and requiring different types of behavioural responses. We found that P.S. significantly underestimated the size of stimuli presented in her left visual field. When comparison tasks involved stimuli placed along the vertical axis or in the right visual field, P.S. performed well. The vertical and horizontal components of size distortion were found to be differentially affected. We conclude that size processing may be dissociated from other aspects of visual processing, such as form or colour processing, and depends critically on part of the occipital, prestriate areas (Brodmann areas 18–19).

size perception; micropsia; dysmetropsia; visual perception

BA = Brodmann area; JND = just noticeable difference; PSE = point of subjective equality


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