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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: https://doi.org/10.1167/6.6.814.
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© ARVO (1962-2015); The Authors (2016-present)
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.
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