Document Detail

Is visual processing in the dorsal stream accessible to consciousness?
MedLine Citation:
PMID:  22456882     Owner:  NLM     Status:  MEDLINE    
There are two highly interconnected clusters of visually responsive areas in the primate cortex. These two clusters have relatively few interconnections with each other, though those interconnections are undoubtedly important. One of the two main clusters (the dorsal stream) links the primary visual cortex (V1) to superior regions of the occipito-parietal cortex, while the other (the ventral stream) links V1 to inferior regions of the occipito-temporal cortex. According to our current understanding of the functional anatomy of these two systems, the dorsal stream's principal role is to provide real-time 'bottom-up' visual guidance of our movements online. In contrast, the ventral stream, in conjunction with top-down information from visual and semantic memory, provides perceptual representations that can serve recognition, visual thought, planning and memory offline. In recent years, this interpretation, initially based chiefly on studies of non-human primates and human neurological patients, has been well supported by functional MRI studies in humans. This perspective presents empirical evidence for the contention that the dorsal stream governs the visual control of movement without the intervention of visual awareness.
A D Milner
Publication Detail:
Type:  Journal Article; Review     Date:  2012-03-28
Journal Detail:
Title:  Proceedings. Biological sciences / The Royal Society     Volume:  279     ISSN:  1471-2954     ISO Abbreviation:  Proc. Biol. Sci.     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-05-11     Completed Date:  2012-08-30     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  101245157     Medline TA:  Proc Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  2289-98     Citation Subset:  IM    
Department of Psychology, Durham University, Durham, UK.
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MeSH Terms
Consciousness / physiology*
Magnetic Resonance Imaging
Models, Neurological*
Movement / physiology
Neural Pathways / physiology
Parietal Lobe / physiology*
Visual Cortex / physiology*
Visual Perception / physiology*

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