Journal
BRAIN AND LANGUAGE
Volume 127, Issue 2, Pages 222-229Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bandl.2012.07.007
Keywords
Ventro-dorsal and dorso-dorsal stream; Ventral stream; Use and Grasp systems
Funding
- NINDS NIH HHS [R01 NS065049] Funding Source: Medline
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The distinction between dorsal and ventral visual processing streams, first proposed by Ungerleider and Mishkin (1982) and later refined by Milner and Goodale (1995) has been elaborated substantially in recent years, spurred by two developments. The first was proposed in large part by Rizzolatti and Matelli (2003) and is a more detailed description of the multiple neural circuits connecting the frontal, temporal, and parietal cortices. Secondly, there are a number of behavioral observations that the classic two visual systems hypothesis is unable to accommodate without additional assumptions. The notion that the Dorsal stream is specialized for where or how actions and the Ventral stream for What knowledge cannot account for two prominent disorders of action, limb apraxia and optic ataxia, that represent a double dissociation in terms of the types of actions that are preserved and impaired. A growing body of evidence, instead, suggests that there are at least two distinct Dorsal routes in the human brain, referred to as the Grasp and Use systems. Both of these may be differentiated from the Ventral route in terms of neuroanatomic localization, representational specificity, and time course of information processing. (C) 2012 Elsevier Inc. All rights reserved.
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