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English Abstract
Journal Article
[A case of agnosia for streets and houses unaccompanied by prosopagnosia of familiar faces due to the right occipital lobe infarction].
Rinshō Shinkeigaku = Clinical Neurology 2000 September
We reported a patient who showed agnosia for streets and homes unaccompanied by prosopagnosia of familiar faces following infarction in the right occipital lobe. A 70-years-old right-handed man admitted to our department because of sudden development of visual impairment. He had left hemianopsia, left unilateral spatial neglect and slight visual memory disturbance but no other neurological abnormalities. His verbal memory was maintained intact. He was, however, unable to distinguish the sceneries of buildings and streets regardless of their familiarities and often got lost in the hospital. His topographical abilities in map-sketching and route-description were partially impaired depending upon the familiarity of targets; the disability was observed toward unfamiliar targets. His ability in facial recognition was also partially impaired depending upon the familiarity of persons. The patient was unable to distinguish faces of unfamiliar persons, such as nurses and doctors whom he met following stroke, whereas he was able to distinguish faces of familiar persons, such as his family and friends. The brain MRI demonstrated infarction in the right medial occipital lobe including parahippocampal gyrus, lingual gyrus and fusiform gyrus. In general, the manifestation of agnosia for streets and houses is associated with prosopagnosia. The present case, however, exhibited only the former in association with the partial manifestation of the latter. The fact suggests that those two are independent syndromes. The present case also showed a dissociation in the abilities of topographical and facial recognition according to the familiarity of targets. The process for the retrieval and reference of acquired information and that for the acquirement of new visual information may work in an independent manner.
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