The Separation of Overlapping Neuromagnetic Sources in First and Second Somatosensory Cortices

Thumbnail Image
Date
1995
Authors
Junghöfer, Markus
Scholz, B.
Schneider, Siegfried
Editors
Contact
Journal ISSN
Electronic ISSN
ISBN
Bibliographical data
Publisher
Series
DOI (citable link)
ArXiv-ID
International patent number
EU project number
Project
Open Access publication
Collections
Restricted until
Title in another language
Research Projects
Organizational Units
Journal Issue
Publication type
Journal article
Publication status
Published in
Brain Topography ; 7 (1995), 4. - pp. 275-282
Abstract
In response to a somatosensory stimulus, two cortical centers in each hemisphere produce neural mass activity large enough to be detected with electric (EEG) or magnetic (MEG) measurements. Both the primary somatosensory cortex (S-I), located in the postcentral sulcus and in the depths of the central sulcus, as well as the secondary somatic sensory cortex (S-II), lying in the upper bank of the Sylvian fissure, respond within the first 100ms such that the two activities overlap in time. We demonstrate that this overlap can be disentangled using a MUSIC-type approach, as suggested by Oppelt and Scholz. It needs no a priori information about the sources. As the results show, there are several instances in time in which only one of the two centers (SI, SII) is active. It is only for these time segments that a single moving dipole yields meaningful results. Such time intervals occur during the upstroke of the late component around 60 ms (only SI activity) and during the down-stroke around 120 ms (only SII activity). In these time intervals the activity of one of the somatosensory areas is still large enough, while the other center is not yet or is no longer active.
Summary in another language
Subject (DDC)
150 Psychology
Keywords
MEG,Somatosensory cortex,Source modeling,MUSIC,Event-related field
Conference
Review
undefined / . - undefined, undefined. - (undefined; undefined)
Cite This
ISO 690ELBERT, Thomas, Markus JUNGHÖFER, B. SCHOLZ, Siegfried SCHNEIDER, 1995. The Separation of Overlapping Neuromagnetic Sources in First and Second Somatosensory Cortices. In: Brain Topography. 7(4), pp. 275-282. Available under: doi: 10.1007/BF01195253
BibTex
@article{Elbert1995Separ-10110,
  year={1995},
  doi={10.1007/BF01195253},
  title={The Separation of Overlapping Neuromagnetic Sources in First and Second Somatosensory Cortices},
  number={4},
  volume={7},
  journal={Brain Topography},
  pages={275--282},
  author={Elbert, Thomas and Junghöfer, Markus and Scholz, B. and Schneider, Siegfried}
}
RDF
<rdf:RDF
    xmlns:dcterms="http://purl.org/dc/terms/"
    xmlns:dc="http://purl.org/dc/elements/1.1/"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:bibo="http://purl.org/ontology/bibo/"
    xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#"
    xmlns:foaf="http://xmlns.com/foaf/0.1/"
    xmlns:void="http://rdfs.org/ns/void#"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > 
  <rdf:Description rdf:about="https://kops.uni-konstanz.de/server/rdf/resource/123456789/10110">
    <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-25T09:14:13Z</dcterms:available>
    <dcterms:rights rdf:resource="http://creativecommons.org/licenses/by-nc-nd/2.0/"/>
    <dc:creator>Schneider, Siegfried</dc:creator>
    <dc:contributor>Junghöfer, Markus</dc:contributor>
    <dc:creator>Elbert, Thomas</dc:creator>
    <dc:contributor>Elbert, Thomas</dc:contributor>
    <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/43"/>
    <dcterms:issued>1995</dcterms:issued>
    <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/10110/1/Elbert_1995_The_Separation.pdf"/>
    <dc:contributor>Scholz, B.</dc:contributor>
    <dcterms:abstract xml:lang="eng">In response to a somatosensory stimulus, two cortical centers in each hemisphere produce neural mass activity large enough to be detected with electric (EEG) or magnetic (MEG) measurements. Both the primary somatosensory cortex (S-I), located in the postcentral sulcus and in the depths of the central sulcus, as well as the secondary somatic sensory cortex (S-II), lying in the upper bank of the Sylvian fissure, respond within the first 100ms such that the two activities overlap in time. We demonstrate that this overlap can be disentangled using a MUSIC-type approach, as suggested by Oppelt and Scholz. It needs no a priori information about the sources. As the results show, there are several instances in time in which only one of the two centers (SI, SII) is active. It is only for these time segments that a single moving dipole yields meaningful results. Such time intervals occur during the upstroke of the late component around 60 ms (only SI activity) and during the down-stroke around 120 ms (only SII activity). In these time intervals the activity of one of the somatosensory areas is still large enough, while the other center is not yet or is no longer active.</dcterms:abstract>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-25T09:14:13Z</dc:date>
    <dcterms:title>The Separation of Overlapping Neuromagnetic Sources in First and Second Somatosensory Cortices</dcterms:title>
    <dc:language>eng</dc:language>
    <dc:format>application/pdf</dc:format>
    <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/>
    <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/43"/>
    <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/10110/1/Elbert_1995_The_Separation.pdf"/>
    <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/10110"/>
    <foaf:homepage rdf:resource="http://localhost:8080/"/>
    <dc:contributor>Schneider, Siegfried</dc:contributor>
    <dc:creator>Junghöfer, Markus</dc:creator>
    <dc:rights>Attribution-NonCommercial-NoDerivs 2.0 Generic</dc:rights>
    <dc:creator>Scholz, B.</dc:creator>
    <dcterms:bibliographicCitation>First publ. in: Brain Topography 7 (1995), 4, pp. 275-282</dcterms:bibliographicCitation>
  </rdf:Description>
</rdf:RDF>
Internal note
xmlui.Submission.submit.DescribeStep.inputForms.label.kops_note_fromSubmitter
Contact
URL of original publication
Test date of URL
Examination date of dissertation
Method of financing
Comment on publication
Alliance license
Corresponding Authors der Uni Konstanz vorhanden
International Co-Authors
Bibliography of Konstanz
No
Refereed