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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Baseline brain activity fluctuations predict somatosensory perception in humans</title><author><name sortKey="Boly, M" sort="Boly, M" uniqKey="Boly M" first="M." last="Boly">M. Boly</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation><affiliation><nlm:aff id="aff2">Department of Neurology, Centre Hospitalier Univesitaire, B-4000 Liège 1, Belgium</nlm:aff></affiliation></author><author><name sortKey="Balteau, E" sort="Balteau, E" uniqKey="Balteau E" first="E." last="Balteau">E. Balteau</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation></author><author><name sortKey="Schnakers, C" sort="Schnakers, C" uniqKey="Schnakers C" first="C." last="Schnakers">C. Schnakers</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation></author><author><name sortKey="Degueldre, C" sort="Degueldre, C" uniqKey="Degueldre C" first="C." last="Degueldre">C. Degueldre</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation></author><author><name sortKey="Moonen, G" sort="Moonen, G" uniqKey="Moonen G" first="G." last="Moonen">G. Moonen</name><affiliation><nlm:aff id="aff2">Department of Neurology, Centre Hospitalier Univesitaire, B-4000 Liège 1, Belgium</nlm:aff></affiliation></author><author><name sortKey="Luxen, A" sort="Luxen, A" uniqKey="Luxen A" first="A." last="Luxen">A. Luxen</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation></author><author><name sortKey="Phillips, C" sort="Phillips, C" uniqKey="Phillips C" first="C." last="Phillips">C. Phillips</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation></author><author><name sortKey="Peigneux, P" sort="Peigneux, P" uniqKey="Peigneux P" first="P." last="Peigneux">P. Peigneux</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation></author><author><name sortKey="Maquet, P" sort="Maquet, P" uniqKey="Maquet P" first="P." last="Maquet">P. Maquet</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation><affiliation><nlm:aff id="aff2">Department of Neurology, Centre Hospitalier Univesitaire, B-4000 Liège 1, Belgium</nlm:aff></affiliation></author><author><name sortKey="Laureys, S" sort="Laureys, S" uniqKey="Laureys S" first="S." last="Laureys">S. Laureys</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation><affiliation><nlm:aff id="aff2">Department of Neurology, Centre Hospitalier Univesitaire, B-4000 Liège 1, Belgium</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">17616583</idno><idno type="pmc">1924544</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1924544</idno><idno type="RBID">PMC:1924544</idno><idno type="doi">10.1073/pnas.0611404104</idno><date when="2007">2007</date><idno type="wicri:Area/Pmc/Corpus">000293</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000293</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Baseline brain activity fluctuations predict somatosensory perception in humans</title><author><name sortKey="Boly, M" sort="Boly, M" uniqKey="Boly M" first="M." last="Boly">M. Boly</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation><affiliation><nlm:aff id="aff2">Department of Neurology, Centre Hospitalier Univesitaire, B-4000 Liège 1, Belgium</nlm:aff></affiliation></author><author><name sortKey="Balteau, E" sort="Balteau, E" uniqKey="Balteau E" first="E." last="Balteau">E. Balteau</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation></author><author><name sortKey="Schnakers, C" sort="Schnakers, C" uniqKey="Schnakers C" first="C." last="Schnakers">C. Schnakers</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation></author><author><name sortKey="Degueldre, C" sort="Degueldre, C" uniqKey="Degueldre C" first="C." last="Degueldre">C. Degueldre</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation></author><author><name sortKey="Moonen, G" sort="Moonen, G" uniqKey="Moonen G" first="G." last="Moonen">G. Moonen</name><affiliation><nlm:aff id="aff2">Department of Neurology, Centre Hospitalier Univesitaire, B-4000 Liège 1, Belgium</nlm:aff></affiliation></author><author><name sortKey="Luxen, A" sort="Luxen, A" uniqKey="Luxen A" first="A." last="Luxen">A. Luxen</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation></author><author><name sortKey="Phillips, C" sort="Phillips, C" uniqKey="Phillips C" first="C." last="Phillips">C. Phillips</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation></author><author><name sortKey="Peigneux, P" sort="Peigneux, P" uniqKey="Peigneux P" first="P." last="Peigneux">P. Peigneux</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation></author><author><name sortKey="Maquet, P" sort="Maquet, P" uniqKey="Maquet P" first="P." last="Maquet">P. Maquet</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation><affiliation><nlm:aff id="aff2">Department of Neurology, Centre Hospitalier Univesitaire, B-4000 Liège 1, Belgium</nlm:aff></affiliation></author><author><name sortKey="Laureys, S" sort="Laureys, S" uniqKey="Laureys S" first="S." last="Laureys">S. Laureys</name><affiliation><nlm:aff id="aff1">Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</nlm:aff></affiliation><affiliation><nlm:aff id="aff2">Department of Neurology, Centre Hospitalier Univesitaire, B-4000 Liège 1, Belgium</nlm:aff></affiliation></author></analytic><series><title level="j">Proceedings of the National Academy of Sciences of the United States of America</title><idno type="ISSN">0027-8424</idno><idno type="eISSN">1091-6490</idno><imprint><date when="2007">2007</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>In perceptual experiments, within-individual fluctuations in perception are observed across multiple presentations of the same stimuli, a phenomenon that remains only partially understood. Here, by means of thulium–yttrium/aluminum–garnet laser and event-related functional MRI, we tested whether variability in perception of identical stimuli relates to differences in prestimulus, baseline brain activity. Results indicate a positive relationship between conscious perception of low-intensity somatosensory stimuli and immediately preceding levels of baseline activity in medial thalamus and the lateral frontoparietal network, respectively, which are thought to relate to vigilance and “external monitoring.” Conversely, there was a negative correlation between subsequent reporting of conscious perception and baseline activity in a set of regions encompassing posterior cingulate/precuneus and temporoparietal cortices, possibly relating to introspection and self-oriented processes. At nociceptive levels of stimulation, pain-intensity ratings positively correlated with baseline fluctuations in anterior cingulate cortex in an area known to be involved in the affective dimension of pain. These results suggest that baseline brain-activity fluctuations may profoundly modify our conscious perception of the external world.</p></div></front></TEI><pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Proc Natl Acad Sci U S A</journal-id><journal-id journal-id-type="publisher-id">PNAS</journal-id><journal-title>Proceedings of the National Academy of Sciences of the United States of America</journal-title><issn pub-type="ppub">0027-8424</issn><issn pub-type="epub">1091-6490</issn><publisher><publisher-name>National Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">17616583</article-id><article-id pub-id-type="pmc">1924544</article-id><article-id pub-id-type="publisher-id">6888</article-id><article-id pub-id-type="doi">10.1073/pnas.0611404104</article-id><article-categories><subj-group subj-group-type="heading"><subject>Biological Sciences</subject><subj-group><subject>Neuroscience</subject></subj-group></subj-group></article-categories><title-group><article-title>Baseline brain activity fluctuations predict somatosensory perception in humans</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Boly</surname><given-names>M.</given-names></name><xref rid="aff1" ref-type="aff"><sup>†</sup></xref><xref rid="aff2" ref-type="aff"><sup>‡</sup></xref><xref ref-type="corresp" rid="cor1"><sup>§</sup></xref></contrib><contrib contrib-type="author"><name><surname>Balteau</surname><given-names>E.</given-names></name><xref rid="aff1" ref-type="aff"><sup>†</sup></xref></contrib><contrib contrib-type="author"><name><surname>Schnakers</surname><given-names>C.</given-names></name><xref rid="aff1" ref-type="aff"><sup>†</sup></xref></contrib><contrib contrib-type="author"><name><surname>Degueldre</surname><given-names>C.</given-names></name><xref rid="aff1" ref-type="aff"><sup>†</sup></xref></contrib><contrib contrib-type="author"><name><surname>Moonen</surname><given-names>G.</given-names></name><xref rid="aff2" ref-type="aff"><sup>‡</sup></xref></contrib><contrib contrib-type="author"><name><surname>Luxen</surname><given-names>A.</given-names></name><xref rid="aff1" ref-type="aff"><sup>†</sup></xref></contrib><contrib contrib-type="author"><name><surname>Phillips</surname><given-names>C.</given-names></name><xref rid="aff1" ref-type="aff"><sup>†</sup></xref></contrib><contrib contrib-type="author"><name><surname>Peigneux</surname><given-names>P.</given-names></name><xref rid="aff1" ref-type="aff"><sup>†</sup></xref></contrib><contrib contrib-type="author"><name><surname>Maquet</surname><given-names>P.</given-names></name><xref rid="aff1" ref-type="aff"><sup>†</sup></xref><xref rid="aff2" ref-type="aff"><sup>‡</sup></xref></contrib><contrib contrib-type="author"><name><surname>Laureys</surname><given-names>S.</given-names></name><xref rid="aff1" ref-type="aff"><sup>†</sup></xref><xref rid="aff2" ref-type="aff"><sup>‡</sup></xref></contrib><aff id="aff1"><sup>†</sup>Coma Science Group, Cyclotron Research Center, B30, Allée du 6 Août, Sart Tilman, University of Liège, B-4000 Liège, Belgium;</aff><aff id="aff2"><sup>‡</sup>Department of Neurology, Centre Hospitalier Univesitaire, B-4000 Liège 1, Belgium</aff></contrib-group><author-notes><corresp id="cor1"><sup>§</sup>To whom correspondence should be addressed. E-mail: <email>mboly@student.ulg.ac.be</email></corresp><fn fn-type="edited-by"><p>Edited by Edward G. Jones, University of California, Davis, CA, and accepted by the Editorial Board May 25, 2007</p></fn><fn fn-type="con"><p>Author contributions: M.B. and S.L. designed research; M.B., E.B., C.S., and S.L. performed research; E.B., C.D., G.M., A.L., C.P., P.P., and P.M. contributed reagents/analytic tools; M.B. and S.L. analyzed data; and M.B. and S.L. wrote the paper.</p></fn></author-notes><pub-date pub-type="ppub"><day>17</day><month>7</month><year>2007</year></pub-date><pub-date pub-type="epub"><day>6</day><month>7</month><year>2007</year></pub-date><volume>104</volume><issue>29</issue><fpage>12187</fpage><lpage>12192</lpage><history><date date-type="received"><day>22</day><month>12</month><year>2006</year></date></history><copyright-statement>© 2007 by The National Academy of Sciences of the USA</copyright-statement><copyright-year>2007</copyright-year><self-uri xlink:title="pdf" xlink:type="simple" xlink:href="zpq02907012187.pdf"></self-uri><abstract><p>In perceptual experiments, within-individual fluctuations in perception are observed across multiple presentations of the same stimuli, a phenomenon that remains only partially understood. Here, by means of thulium–yttrium/aluminum–garnet laser and event-related functional MRI, we tested whether variability in perception of identical stimuli relates to differences in prestimulus, baseline brain activity. Results indicate a positive relationship between conscious perception of low-intensity somatosensory stimuli and immediately preceding levels of baseline activity in medial thalamus and the lateral frontoparietal network, respectively, which are thought to relate to vigilance and “external monitoring.” Conversely, there was a negative correlation between subsequent reporting of conscious perception and baseline activity in a set of regions encompassing posterior cingulate/precuneus and temporoparietal cortices, possibly relating to introspection and self-oriented processes. At nociceptive levels of stimulation, pain-intensity ratings positively correlated with baseline fluctuations in anterior cingulate cortex in an area known to be involved in the affective dimension of pain. These results suggest that baseline brain-activity fluctuations may profoundly modify our conscious perception of the external world.</p></abstract><kwd-group><kwd>consciousness</kwd><kwd>functional MRI</kwd><kwd>pain</kwd></kwd-group></article-meta></front></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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