Journal

The Japanese journal of neuropsychology

[Vol.25 No.2 contents]
Japanese/English

Full Text of this Article
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ArticleTitle Visuocognitive disorders
Language J
AuthorList Kazumi Hirayama
Affiliation Department of Behavioral Neurology and Cognitive Neuroscience, Tohoku University Graduate School of Medicine
Publication Japanese Journal of Neuropsychology: 25 (2), 137-147, 2009
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 aperceptive, integrative or associative type of visual agnosia. Lesions on the dorso-dorsal stream can produce optic ataxia or defective prehension. Responsible cites and detailed features of these symptoms are discussed with reference to the functions of those two streams.
Keywords dorso-dorsal stream, ventral stream, visual agnosia, intraparietal sulcus, optic ataxia

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