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PubMed · 2011260

Alexia without agraphia associated with spleniogeniculate infarction.

E W Stommel·R J Friedman·A G Reeves
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Abstract

Pure alexia, following an infarction in the distribution of the left posterior cerebral artery, is attributed to damage of the left occipital lobe and the splenium of the corpus callosum. We describe a case of pure alexia in a 57-year-old woman with infarction of the left lateral geniculate body and the splenium of the corpus callosum, a variation on this classic disconnection syndrome.

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Cerebral InfarctionCorpus CallosumDyslexia, AcquiredFemaleGeniculate BodiesHumansMagnetic Resonance ImagingMiddle AgedCase ReportsJournal Article

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E W Stommel, R J Friedman, A G Reeves. 1991. Alexia without agraphia associated with spleniogeniculate infarction.. https://doi.org/10.1212/wnl.41.4.587

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[Neural mechanisms for object and color recognition].

We reported double-dissociation between the visual processing of the edges and the surfaces of objects. Patients with lateral occipital damage showed selective impairment in the perception of edges whereas those with medial ventral occipital damage showed selective impairment in the perception of the 3D structure of the surface. Patients with medial ventral occipital damage also exhibited impaired perception of color, which is also a surface property. Those results were consistent with those from neuroimaging studies. Taken together, those studies suggest that objects may be processed in two separate pathways in the ventral occipital cortex: the edges of objects are processed in the lateral pathway and the surface of objects are processed in the medial pathway. Both edges and surfaces play important roles in object recognition, and both types of perception should be evaluated in patients with visual agnosia.

Cerebral Infarction↗