両側—後頭・側頭葉病変による視覚失認の１例

A patient, 54 year-old right-handed man, showed intra-cerebral hematoms in bilateral occipito-temporal areas after a fall to the ground. Besides a left upper quadrantic homonymous hemianopsia, he had associative visual agnosia, prosopagnosia, central achromatopsia, pure alexia and slight agraphia and acalculia. He matched and copied well pictures and letters which he could not recognize. After three years, object recognition and reading improved greatly, prosopagnosia and achromatopsia remained almost unchanged. He could not identify human faces, nor discriminate the kind or the individual of animals, birds, flowers and vegetables. The visual recognition process was compared between in the case of human faces, animals etc. and in that of common objects.