Document Detail

Cortical processing of visual and tactile stimuli studied by non-invasive rCBF measurements.
MedLine Citation:
PMID:  6874439     Owner:  NLM     Status:  MEDLINE    
Blood flow determinations were made in 32 cortical regions of normal subjects during processing of visual and tactile stimuli. One experiment involved eight subjects who were studied during three conditions of visual stimulation achieved by a Spiral-After-Effect (SAE) apparatus: 1. looking at a stationary spiral, 2. a rotating spiral, and 3. performing the SAE test. Average cortical flow increases during these conditions compared to resting were 5%, 7% and 12% respectively. Local activation was seen in occipital, parietal, temporal, and frontal regions. The magnitude and spread of local flow increases were related to task complexity. In another experiment ten subjects were studied during rest and tactile stimulation of the right hand, left hand, and both. The subjects were instructed either to ignore the stimulation (sensation) or to pay attention to it. Sensation was accompanied by parietal and prefrontal flow increases contralateral to side of stimulation. Attention to the right hand mainly enhanced right hemisphere flow, in the same areas as during sensation. Attention to the left hand was associated with large, diffuse flow increases in both hemispheres. The results support recent proposals of right hemisphere dominance for functions related to attention.
J Risberg; I Prohovnik
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Human neurobiology     Volume:  2     ISSN:  0721-9075     ISO Abbreviation:  Hum Neurobiol     Publication Date:  1983  
Date Detail:
Created Date:  1983-09-23     Completed Date:  1983-09-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8211530     Medline TA:  Hum Neurobiol     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  5-10     Citation Subset:  IM; S    
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MeSH Terms
Arousal / physiology
Attention / physiology
Cerebral Cortex / blood supply*
Dominance, Cerebral / physiology
Figural Aftereffect / physiology
Form Perception / physiology
Motion Perception / physiology
Regional Blood Flow
Sensory Thresholds
Touch / physiology*
Visual Perception / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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