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Brain, Vol. 125, No. 1, 58-74, January 1, 2002
© 2002 Oxford University Press

Seeing, since childhood, without ventral stream: a behavioural study

Sandra Lê1, Dominique Cardebat1, Kader Boulanouar1, Marie-Anne Hénaff2, François Michel2, David Milner3, Chris Dijkerman3, Michèle Puel1 and Jean-François Démonet1

1INSERM U455 and Federation of Neurology, CHU Purpan, Toulouse, 2INSERM U280, Lyon, France and 3Department of Psychology, University of Durham, UK Correspondence to: Sandra Lê, INSERM U455, Federation of Neurology, CHU Purpan, F-31059 Toulouse Cedex, France E-mail: sandrale{at}purpan.inserm.fr

We report the case of a 30-year-old man (S.B.) who developed visual agnosia following a meningoencephalitis at the age of 3 years. MRI disclosed extensive bilateral lesions of the occipital temporal visual pathway (ventral stream) and lesions in the right dorsal pathway, sparing primary visual cortices. S.B. showed a severe visual recognition deficit (texture, colour, objects, faces and words), although movement and space perception were largely preserved. His remaining visual capacities illustrate the competence of an isolated dorsal system which essentially functions on the sole basis of magnocellular afferents (low spatial resolution, high sensitivity to low contrast and moving stimuli). Patient S.B. also shows remarkable visuomotor competences, despite his perceptual limitations. It is suggested that his perceptual capacities correspond to the visual processing limitations of the dorsal visual stream, which in this patient have become accessible to perceptual awareness.


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