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| Research article summary (published 18 Sep 2002): |
PET studies of somatosensory processing of light touch.
Full Abstract
The studies discussed in this report investigate the neural mechanisms involved in processing a light tactile stimulus as measured by positron emission tomography (PET). This light tactile stimulus (a 2-Hz tap with a von Frey hair) produced a significant increase in regional cerebral blood flow (rCBF) in contralateral primary somatosensory cortex (SI) and bilateral secondary somatosensory cortex (SII), with a larger response in the side contralateral to the stimulus. Light tactile stimulation also produced activity in multiple discrete areas in the human inferior parietal lobule (IPL), which we believe to comprise a region homologous to the monkey area 7b or feline tertiary somatosensory cortex (SIII). Directing attention to the tactile stimulus increased blood flow to SIII and activated a right-lateralized cortical network, regardless of the side of body stimulated. Directed attention to the stimulus decreased blood flow to visual cortex, but minimally modulated SI rCBF.
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Author information
Author/s: Hagen, Matthew C (MC); Pardo, José V (JV);
Affiliation: Department of Psychiatry, Division of Neuroscience Research, Neuroscience Graduate Program, University of Minnesota, Minnesota, MN 55454, USA.
Grants: 5 F30 MH12575-02 (Agency:United States NIMH)
Journal and publication information
Publication Type: Clinical Trial; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.
Journal: Behavioural brain research (Behav Brain Res), published in Netherlands. (Language: eng)
Reference: 2002-Sep; vol 135 (issue 1-2) : pp 133-40
Dates: Created 2002/10/01; Completed 2002/11/25; Revised 2007/11/14;
PMID: 12356443, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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