Linked Life Data

12421662

Source:http://linkedlifedata.com/resource/pubmed/id/12421662

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2002-11-7
pubmed:abstractText
In order to explore human cortical areas involved in active attention toward a somatosensory modality, somatosensory evoked cortical magnetic fields were recorded in ten healthy adults with a 122-channel whole-head magnetometer while the subjects performed the selective attention task. Two kinds of stimulus modality, somatosensory and auditory, were presented independently in the same session. For the somatosensory modality, a randomized sequence of strong (P=0.45) and weak (P=0.05) electric stimuli was delivered to the right median nerve at the wrist. For the auditory modality, a randomized sequence of 900-Hz (P=0.45) and 950-Hz (P=0.05) tones was delivered to both ears. Subjects were requested to pay attention to the specified stimulus modality (either somatosensory or auditory) and to count the number of rare stimuli of the attended modality (weak stimuli in the somatosensory or 950-Hz tone in the auditory modality). A total of 12 sessions were performed for each subject, among which the order of attended modality was changed alternately and counterbalanced among subjects. In the data analysis, somatosensory evoked fields for frequent stimuli (strong electric stimuli) were compared between the two conditions; attend somatosensory condition (ATS) and attend auditory condition (non-attend somatosensory condition; NATS). In six out of the ten subjects, somatosensory evoked fields showed attention-related change. The magnitude of the estimated generator source in SII, but not in SI, significantly increased from NATS to ATS while keeping the same locations. Moreover, a simulation study using the estimated sources in SII in NATS supported the enhancement of the activity in the SII rather than participation of additional sources in the selective attention task. These results suggest that the SII plays a main role in selective somatosensory attention.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0926-6410
pubmed:author
pubmed:issnType
Print
pubmed:volume
14
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
389-97
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2002
pubmed:articleTitle
Second somatosensory area (SII) plays a significant role in selective somatosensory attention.
pubmed:affiliation
Department of Brain Pathophysiology, Human Brain Research Center, Kyoto University Graduate School of Medicine, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't