Occlusive vascular disease of the posterior cerebral arteries produced infarction destroying the left medial occipital area, the splenium of the corpus callosum, and the right inferior longitudinal fasciculus of a patient with visual agnosia. Some of the reported neurobehavioral abnormalities (alexia without agraphia, color agnosia, and verbal memory defect) were readily correlated with the observed lesions. Other abnormalities, particularly the visual agnosia and prosopagnosia, are less ...

Three patients with conduction aphasia are described; in addition to the distinctive language disorder, two of them had severe ideomotor apraxia while the other was entirely free of apraxia. Postmortem examination revealed that the two patients with apraxia had entirely suprasylvian lesions involving the white matter deep to the parietal operculum, while the nonapraxic subject had suffered total destruction of the Wernicke area. Based on these findings and a review of the literature, we ...