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Original Articles

A tale of two agnosias: Distinctions between form and integrative agnosia

, , , , &
Pages 56-92
Received 03 Jan 2007
Accepted 06 Dec 2007
Published online: 13 Mar 2008
 

The performance of two patients with visual agnosia was compared across a number of tests examining visual processing. The patients were distinguished by having dorsal and medial ventral extrastriate lesions. While inanimate objects were disadvantaged for the patient with a dorsal extrastriate lesion, animate items are disadvantaged for the patient with the medial ventral extrastriate lesion. The patients also showed contrasting patterns of performance on the Navon Test: The patient with a dorsal extrastriate lesion demonstrated a local bias while the patient with a medial ventral extrastriate lesion had a global bias. We propose that the dorsal and medial ventral visual pathways may be characterized at an extrastriate level by differences in local relative to more global visual processing and that this can link to visually based category-specific deficits in processing.

We are extremely grateful for the kind participation of H.J.A., S.A., and K.A. in these studies. The work was supported by grants from the Medical Research Council (MRC) and the Stroke Association, UK.

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