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Behavioural Neurology
Volume 11 (1999), Issue 4, Pages 251-258

Improvement of Mental Imagery after Prism Exposure in Neglect: A Case Study

Gilles Rode,1,2 Yves Rossetti,1,2 Ling Li,1 and Dominique Boisson1,2

1Service de Rééducation Neurologique, Hôpital Henry Gabrielle, Hospices Civils de Lyon and Université Claude Bernard, Lyon, France
2Institut National de la Santé Et de la Recherche Médicale, Unité 534: Espace et Action, 16 avenue Lépine, Case 13, 69676 Bron, France

Received 1 April 1999; Accepted 1 April 1999

Copyright © 1999 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.


Previous work has shown that various symptoms of unilateral neglect, including the pathological shift of the subjective midline to the right, may be improved by a short adaptation period to a prismatic shift of the visual field to the right. We report here the improvement of imagined neglect after prism exposure in a patient with a left unilateral neglect. Despite a strong neglect observed for mental images as well as for conventional tests, the mental evocation of left-sided information from an internal image of the map of France map was fully recovered following prism adaptation to the right. This improvement could not be explained by the alteration of visuomotor responses induced by the prism adaptation. Prism adaptation may therefore act not only on sensory-motor levels but also on a higher cognitive level of mental space representation and/or exploration.