The Japanese journal of neuropsychology

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ArticleTitle	Cognitive visual dysfunction
Language	J
AuthorList	Kyoko Suzuki
Affiliation	Department of Clinical Neuroscience, Yamagata University Graduate School of Medicine
Publication	Japanese Journal of Neuropsychology: 28 (1), 23-28, 2012
Received
Accepted
Abstract	Two cortical visual streams separately process visual information; the ventral stream, projecting from striate cortex to infero-temporal cortex, and the dorsal stream, projecting from striate cortex to posterior parietal cortex. The ventral stream subserves long-term information for object identification. Patients with damage to the structures in the ventral stream may develop visual agnosia, demonstrating problems with object recognition through vision. Object identification in patients with visual agnosia is quite unstable and easily affected by other factors, such as language. Furthermore incomplete object recognition through vision may interfere with object identification through other sensory modalities. Visual attention is also closely related to object recognition. As many functional systems affect the processes of visual object identification, qualitative analysis of symptoms needs to be carried out to determine the cause of dynamic change in visual recognition.
Keywords	agnosia, visual cognition, visual attention, texture