The Japanese journal of neuropsychology

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ArticleTitle	Neuropsychological symptoms after occipital lobe injury
Language	J
AuthorList	Kazumi Hirayama
Affiliation	Department of Occupational Therapy, Yamagata Prefectural University of Health Sciences
Publication	Japanese Journal of Neuropsychology: 31 (3), 169-182, 2015
Received
Accepted
Abstract	Converging evidence indicates that there are three streams of information processing in man: 1) ventral stream, which directed to the temporal lobe for processing shape and color of the object to identify them and to retrieve the knowledge of them; 2) ventro-dorsal stream, which directed to the inferior parietal lobule for processing object location and movement to form conscious representation of objects; 3) dorso-dorsal stream, which directed to the intraparietal sulcus and the superior parietal lobule for processing location movement and shape of the object to control actions toward the object unconsciously. Lesions on the ventral stream can produce cerebral achromatopsia, agnostic alexia, prosopagnosia, or environmental agnosia. Lesions on the ventro-dorsal stream can produce akinetopsia or visual inattention. Lesions on the dorso-dorsal stream can produce visuomotor ataxia or defective prehension. Responsible cites and features of these symptoms are discussed with reference to the functions of those three streams.
Keywords	cerebral achromatopsia, agnostic alexia, prosopagnosia, visual inattention, visuomotor ataxia