May 2008
Volume 8, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   May 2008
Preserved motion processing and visuomotor control in a patient with large bilateral lesions of occipitotemporal cortex
Author Affiliations
  • Melvyn A. Goodale
    CIHR Group on Action and Perception, The University of Western Ontario, London ON, Canada
  • Marla E. Wolf
    CIHR Group on Action and Perception, The University of Western Ontario, London ON, Canada
  • Robert L. Whitwell
    CIHR Group on Action and Perception, The University of Western Ontario, London ON, Canada
  • Liana E. Brown
    Department of Psychology, Trent University, Peterborough, ON, Canada
  • Jonathan S. Cant
    CIHR Group on Action and Perception, The University of Western Ontario, London ON, Canada
  • Craig S. Chapman
    CIHR Group on Action and Perception, The University of Western Ontario, London ON, Canada
  • Jessica K. Witt
    Department of Psychological Sciences, Purdue University, West Lafayette, IN, USA
  • Stephen R. Arnott
    CIHR Group on Action and Perception, The University of Western Ontario, London ON, Canada
  • Sarah A. Khan
    CIHR Group on Action and Perception, The University of Western Ontario, London ON, Canada
  • Philippe A. Chouinard
    CIHR Group on Action and Perception, The University of Western Ontario, London ON, Canada
  • Jody C. Culham
    CIHR Group on Action and Perception, The University of Western Ontario, London ON, Canada
  • Gordon N. Dutton
    Royal Hospital for Sick Children, Glasgow, UK
Journal of Vision May 2008, Vol.8, 371. doi:10.1167/8.6.371
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      Melvyn A. Goodale, Marla E. Wolf, Robert L. Whitwell, Liana E. Brown, Jonathan S. Cant, Craig S. Chapman, Jessica K. Witt, Stephen R. Arnott, Sarah A. Khan, Philippe A. Chouinard, Jody C. Culham, Gordon N. Dutton; Preserved motion processing and visuomotor control in a patient with large bilateral lesions of occipitotemporal cortex. Journal of Vision 2008;8(6):371. doi: 10.1167/8.6.371.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

According to Goodale and Milner, visual perception is mediated by the ventral stream and the visual control of action by the dorsal stream of cortical visual projections. The initial neuropsychological evidence for this idea was based strongly on a single case, DF, who has impaired object recognition but spared visual control of grasping, consistent with lesions to lateral occipital (LO) cortex but intact dorsal-stream processing. Here we present data from a new patient, MC, a 38-year-old woman who shows very similar behaviour to DF despite much more extensive bilateral occipitotemporal lesions that encompass not only LO but most of early visual cortex in the occipital lobe, except for a small tag of tissue in the rostral calcarine cortex (Culham et al., VSS 2008). MC shows some preserved motion perception, but is unable to identify line drawings (or real exemplars) of common objects or discriminate colours or visual textures. Not surprisingly, MC cannot discriminate between rectangular objects with different dimensions; nor can she indicate their width manually. Remarkably, however, when she reaches out to grasp such objects, her in-flight grasp scales to the object's size. Similarly, even though MC cannot discriminate between objects of varying shape, she chooses stable grasp points on those objects when she reaches out to pick them up. The case of MC not only reinforces the conclusions about separate visual processing for perception and action drawn from DF, but also suggests that visuomotor mechanisms in the dorsal stream are capable of mediating the processing of object features such as size, shape, and orientation for the control of visually guided grasping even with highly impoverished (or perhaps entirely absent) input from the ventral stream and early visual areas.

Goodale, M. A. Wolf, M. E. Whitwell, R. L. Brown, L. E. Cant, J. S. Chapman, C. S. Witt, J. K. Arnott, S. R. Khan, S. A. Chouinard, P. A. Culham, J. C. Dutton, G. N. (2008). Preserved motion processing and visuomotor control in a patient with large bilateral lesions of occipitotemporal cortex [Abstract]. Journal of Vision, 8(6):371, 371a, http://journalofvision.org/8/6/371/, doi:10.1167/8.6.371. [CrossRef]
Footnotes
 Supported by grants from the Canadian Institutes of He alth Research to MG and JC. We are very grateful to the patient and her family for their generous participation.
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