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  4. The anatomy of object recognition - visual form agnosia caused by medial occipitotemporal stroke
 
research article

The anatomy of object recognition - visual form agnosia caused by medial occipitotemporal stroke

Karnath, Hans-Otto
•
Rüter, Johannes
•
Mandler, André
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2009
The Journal of neuroscience

The influential model on visual information processing by Milner and Goodale (1995) has suggested a dissociation between action- and perception-related processing in a dorsal versus ventral stream projection. It was inspired substantially by the observation of a double dissociation of disturbed visual action versus perception in patients with optic ataxia on the one hand and patients with visual form agnosia (VFA) on the other. Unfortunately, almost all cases withVFAreported so far suffered from inhalational intoxication, the majority with carbon monoxide (CO). Since CO induces a diffuse and widespread pattern of neuronal and white matter damage throughout the whole brain, precise conclusions from these patients with VFA on the selective role of ventral stream structures for shape and orientation perception were difficult. Here, we report patient J.S., who demonstrated VFA after a well circumscribed brain lesion due to stroke etiology. Like the famous patient D.F. with VFA after CO intoxication studied by Milner, Goodale, and coworkers (Goodale et al., 1991, 1994; Milner et al., 1991; Servos et al., 1995; Mon-Williams et al., 2001a,b; Wann et al., 2001; Westwood et al., 2002; McIntosh et al., 2004; Schenk and Milner, 2006), J.S. showed an obvious dissociation between disturbed visual perception of shape and orientation information on the one side and preserved visuomotor abilities based on the same information on the other. In both hemispheres, damage primarily affected the fusiform and the lingual gyri as well as the adjacent posterior cingulate gyrus.Weconclude that these medial structures of the ventral occipitotemporal cortex are integral for the normal flow of shape and of contour information into the ventral stream system allowing to recognize objects.

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Type
research article
DOI
10.1523/JNEUROSCI.5192-08.2009
Author(s)
Karnath, Hans-Otto
Rüter, Johannes
Mandler, André
Himmelbach, Marc
Date Issued

2009

Publisher

Society for Neuroscience

Published in
The Journal of neuroscience
Volume

29

Issue

18

Start page

5854

End page

5862

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
BMI  
Available on Infoscience
June 3, 2010
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/50578
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