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Perspective production in a savant autistic draughtsman

Published online by Cambridge University Press:  09 July 2009

L. Mottron*
Affiliation:
Centre de Recherche, Centre hospitalier Sainte Justine, Department of Psychiatry and Department of Psychology, University of Montreal, Centre de Recherche, Centre hospitalier Côte-des-Neiges, Montreal, Canada
S. Belleville
Affiliation:
Centre de Recherche, Centre hospitalier Sainte Justine, Department of Psychiatry and Department of Psychology, University of Montreal, Centre de Recherche, Centre hospitalier Côte-des-Neiges, Montreal, Canada
*
1 Address for correspondence: Dr Laurent Mottron, Laboratoire de Psychophysiologie Cognitive et de Neuropsychiatrie, Centre de Recherche, Centre hospitalier Sainte Justine, 3100 Ellendale, H3S 1W3, Montréal, Canada.

Synopsis

This study examines perspective construction in an autistic patient (E.C.) with quasi-normal intelligence who exhibits exceptional ability when performing three-dimensional drawings of inanimate objects. Examination of E.C.'s spontaneous graphic productions showed that although his drawings approximate the ‘linear perspective’ system, the subject does not use vanishing points in his productions. Nevertheless, a formal computational analysis of E.C.'s accuracy in an experimental task showed that he was able to draw objects rotated in three-dimensional space more accurately than over-trained controls. This accuracy was not modified by suppressing graphic cues that permitted the construction of a vanishing point. E.C. was also able to detect a perspective incongruency between an object and a landscape at a level superior to that of control subjects. Since E.C. does not construct vanishing points in his drawings, it is proposed that his production of a precise realistic perspective is reached without the use of explicit or implicit perspective rules. ‘Special abilities’ in perspective are examined in relation to existing theoretical models of the cognitive deficit in autism and are compared to other special abilities in autism.

Type
Case Report
Copyright
Copyright © Cambridge University Press 1995

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