TY - JOUR
T1 - Selective horizontal dysmetropsia following prestriate lesion
AU - Frassinetti, Francesca
AU - Nichelli, Paolo
AU - Di Pellegrino, Giuseppe
PY - 1999/2
Y1 - 1999/2
N2 - 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).
AB - 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).
KW - Dysmetropsia
KW - Micropsia
KW - Size perception
KW - Visual perception
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U2 - 10.1093/brain/122.2.339
DO - 10.1093/brain/122.2.339
M3 - Article
C2 - 10071061
AN - SCOPUS:0032949036
VL - 122
SP - 339
EP - 350
JO - Brain
JF - Brain
SN - 0006-8950
IS - 2
ER -