June 2006
Volume 6, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   June 2006
A tale of two agnosias: Functional differences between integrative and visual form agnosia
Author Affiliations
  • M. Jane Riddoch
    University of Birmingham, Birmingham B15 2TTUK
  • Glyn W. Humphreys
    University of Birmingham, Birmingham B15 2TTUK
  • Martyn Bracewell
    University of Birmingham, Birmingham B15 2TTUK
Journal of Vision June 2006, Vol.6, 814. doi:10.1167/6.6.814
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      M. Jane Riddoch, Glyn W. Humphreys, Martyn Bracewell; A tale of two agnosias: Functional differences between integrative and visual form agnosia. Journal of Vision 2006;6(6):814. doi: 10.1167/6.6.814.

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

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Abstract

The performance of two patients with visual agnosia is compared across a number of tests examining visual processing. The patients are distinguished by having dorsal and ventral extrastriate lesions. Clear differences emerge such that inanimate objects are disadvantaged for the patient with a dorsal extrastriate lesion, while animate items are disadvantaged for the patient with the ventral extrastriate lesion. The patients also show contrasting patterns of performance on the Navon Test: the patient with a dorsal extrastriate lesion processing at a local level while the patient with a ventral extrastriaite lesion processing at a global level. We propose that the dorsal and ventral visual pathways may be characterised at an extra-striate level by the differences in local relative to more global visual processing, and that this can link to visually-based category-specific deficits in processing.

Riddoch, M. J. Humphreys, G. W. Bracewell, M. (2006). A tale of two agnosias: Functional differences between integrative and visual form agnosia [Abstract]. Journal of Vision, 6(6):814, 814a, http://journalofvision.org/6/6/814/, doi:10.1167/6.6.814. [CrossRef]
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