Somatosensory working memory performance in humans depends on both engagement and disengagement of regions in a distributed network
Identifieur interne : 000849 ( Istex/Checkpoint ); précédent : 000848; suivant : 000850Somatosensory working memory performance in humans depends on both engagement and disengagement of regions in a distributed network
Auteurs : Saskia Haegens [Pays-Bas] ; Daria Osipova [Pays-Bas] ; Robert Oostenveld [Pays-Bas] ; Ole Jensen [Pays-Bas]Source :
- Human Brain Mapping [ 1065-9471 ] ; 2010-01.
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Abstract
Successful working memory (WM) requires the engagement of relevant brain areas but possibly also the disengagement of irrelevant areas. We used magnetoencephalography (MEG) to elucidate the temporal dynamics of areas involved in a somatosensory WM task. We found an increase in gamma band activity in the primary and secondary somatosensory areas during encoding and retention, respectively. This was accompanied by an increase of alpha band activity over task‐irrelevant regions including posterior and ipsilateral somatosensory cortex. Importantly, the alpha band increase was strongest during successful WM performance. Furthermore, we found frontal gamma band activity that correlated both with behavioral performance and the alpha band increase. We suggest that somatosensory gamma band activity reflects maintenance and attention‐related components of WM operations, whereas alpha band activity reflects frontally controlled disengagement of task‐irrelevant regions. Our results demonstrate that resource allocation involving the engagement of task‐relevant and disengagement of task‐irrelevant regions is needed for optimal task execution. Hum Brain Mapp, 2010. © 2009 Wiley‐Liss, Inc.
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DOI: 10.1002/hbm.20842
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Brain Mapp.</title><idno type="ISSN">1065-9471</idno><idno type="eISSN">1097-0193</idno><imprint><publisher>Wiley Subscription Services, Inc., A Wiley Company</publisher><pubPlace>Hoboken</pubPlace><date type="published" when="2010-01">2010-01</date><biblScope unit="volume">31</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="26">26</biblScope><biblScope unit="page" to="35">35</biblScope></imprint><idno type="ISSN">1065-9471</idno></series><idno type="istex">87F92286B748DF06CA23C33D33F5471C18B6138F</idno><idno type="DOI">10.1002/hbm.20842</idno><idno type="ArticleID">HBM20842</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1065-9471</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>alpha</term><term>executive control</term><term>gamma</term><term>magnetoencephalography (MEG)</term><term>oscillations</term><term>synchronization</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Successful working memory (WM) requires the engagement of relevant brain areas but possibly also the disengagement of irrelevant areas. We used magnetoencephalography (MEG) to elucidate the temporal dynamics of areas involved in a somatosensory WM task. We found an increase in gamma band activity in the primary and secondary somatosensory areas during encoding and retention, respectively. This was accompanied by an increase of alpha band activity over task‐irrelevant regions including posterior and ipsilateral somatosensory cortex. Importantly, the alpha band increase was strongest during successful WM performance. Furthermore, we found frontal gamma band activity that correlated both with behavioral performance and the alpha band increase. We suggest that somatosensory gamma band activity reflects maintenance and attention‐related components of WM operations, whereas alpha band activity reflects frontally controlled disengagement of task‐irrelevant regions. Our results demonstrate that resource allocation involving the engagement of task‐relevant and disengagement of task‐irrelevant regions is needed for optimal task execution. Hum Brain Mapp, 2010. © 2009 Wiley‐Liss, Inc.</div></front></TEI><affiliations><list><country><li>Pays-Bas</li></country><region><li>Gueldre</li></region><settlement><li>Nimègue</li></settlement></list><tree><country name="Pays-Bas"><region name="Gueldre"><name sortKey="Haegens, Saskia" sort="Haegens, Saskia" uniqKey="Haegens S" first="Saskia" last="Haegens">Saskia Haegens</name></region><name sortKey="Jensen, Ole" sort="Jensen, Ole" uniqKey="Jensen O" first="Ole" last="Jensen">Ole Jensen</name><name sortKey="Oostenveld, Robert" sort="Oostenveld, Robert" uniqKey="Oostenveld R" first="Robert" last="Oostenveld">Robert Oostenveld</name><name sortKey="Osipova, Daria" sort="Osipova, Daria" uniqKey="Osipova D" first="Daria" last="Osipova">Daria Osipova</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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