Transient inhibition of the dorsolateral prefrontal cortex disrupts somatosensory modulation during standing balance as measured by electroencephalography
Identifieur interne : 002697 ( Main/Curation ); précédent : 002696; suivant : 002698Transient inhibition of the dorsolateral prefrontal cortex disrupts somatosensory modulation during standing balance as measured by electroencephalography
Auteurs : David A. E. Bolton [Canada] ; Katlyn E. Brown [Canada] ; William E. Mcllroy [Canada] ; W. Richard Staines [Canada]Source :
- Neuroreport : (Oxford) [ 0959-4965 ] ; 2012.
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- Pascal (Inist)
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- topic : Homme.
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Abstract
Several studies have shown that a light fingertip touch on a stable surface reduces body sway for individuals standing with their eyes closed even when touch forces are too low to offer mechanical support. It has been proposed that this is due to the availability of sway-relevant sensory feedback from the hand compensating for lost vision. Recently, we revealed modulation of cortical sensory transmission of information from the hand depending on the task (e.g. relevant or not relevant to balance control). Of interest in the present study is the potential origin of task-specific modulation of cortically evoked sensory potentials linked to balance control. We aimed to investigate the role of the prefrontal cortex by temporarily suppressing this region and observing differences in cortical events. Continuous θ-burst stimulation was applied to either the prefrontal cortex or a control stimulation site before balance testing. During balance testing, individuals stood in tandem on a force plate with their eyes closed while lightly touching a stable surface or a sway-referenced surface with the index finger. Throughout testing, the median nerve was stimulated and electroencephalography was used to measure somatosensory-evoked potentials. As expected, the availability of stable light touch reduced the medial-lateral centre of pressure sway. Importantly, in the present study, there was a loss of task-related P200 modulation at FCZ following stimulation of the prefrontal cortex. The present findings support the hypothesis that the prefrontal cortex may serve to regulate task-related sensory reweighting of haptic information that may be used during the control of standing balance.
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E." last="Bolton">David A. E. Bolton</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Kinesiology, University of Waterloo</s1><s2>Waterloo</s2><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Waterloo</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Heart and Stroke Foundation Centre for Stroke Recovery and</s1><s3>CAN</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Heart and Stroke Foundation Centre for Stroke Recovery and</wicri:noRegion></affiliation></author><author><name sortKey="Brown, Katlyn E" sort="Brown, Katlyn E" uniqKey="Brown K" first="Katlyn E." last="Brown">Katlyn E. Brown</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Kinesiology, University of Waterloo</s1><s2>Waterloo</s2><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Waterloo</wicri:noRegion></affiliation></author><author><name sortKey="Mcllroy, William E" sort="Mcllroy, William E" uniqKey="Mcllroy W" first="William E." last="Mcllroy">William E. Mcllroy</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Kinesiology, University of Waterloo</s1><s2>Waterloo</s2><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Waterloo</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Heart and Stroke Foundation Centre for Stroke Recovery and</s1><s3>CAN</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Heart and Stroke Foundation Centre for Stroke Recovery and</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Sunnybrook Health Sciences Centre Research Institute</s1><s2>Toronto, Ontario</s2><s3>CAN</s3><sZ>3 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Sunnybrook Health Sciences Centre Research Institute</wicri:noRegion></affiliation></author><author><name sortKey="Richard Staines, W" sort="Richard Staines, W" uniqKey="Richard Staines W" first="W." last="Richard Staines">W. Richard Staines</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Kinesiology, University of Waterloo</s1><s2>Waterloo</s2><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Waterloo</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Heart and Stroke Foundation Centre for Stroke Recovery and</s1><s3>CAN</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Heart and Stroke Foundation Centre for Stroke Recovery and</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Neuroreport : (Oxford)</title><title level="j" type="abbreviated">Neuroreport : (Oxf.)</title><idno type="ISSN">0959-4965</idno><imprint><date when="2012">2012</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Neuroreport : (Oxford)</title><title level="j" type="abbreviated">Neuroreport : (Oxf.)</title><idno type="ISSN">0959-4965</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Dorsolateral prefrontal cortex</term><term>Electroencephalography</term><term>Human</term><term>Inhibition</term><term>Perception</term><term>Somatosensory evoked potential</term><term>Stimulation</term><term>Tactile sensitivity</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Inhibition</term><term>Cortex préfrontal dorsolatéral</term><term>Electroencéphalographie</term><term>Stimulation</term><term>Sensibilité tactile</term><term>Perception</term><term>Potentiel évoqué somatosensoriel</term><term>Homme</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Homme</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Several studies have shown that a light fingertip touch on a stable surface reduces body sway for individuals standing with their eyes closed even when touch forces are too low to offer mechanical support. It has been proposed that this is due to the availability of sway-relevant sensory feedback from the hand compensating for lost vision. Recently, we revealed modulation of cortical sensory transmission of information from the hand depending on the task (e.g. relevant or not relevant to balance control). Of interest in the present study is the potential origin of task-specific modulation of cortically evoked sensory potentials linked to balance control. We aimed to investigate the role of the prefrontal cortex by temporarily suppressing this region and observing differences in cortical events. Continuous θ-burst stimulation was applied to either the prefrontal cortex or a control stimulation site before balance testing. During balance testing, individuals stood in tandem on a force plate with their eyes closed while lightly touching a stable surface or a sway-referenced surface with the index finger. Throughout testing, the median nerve was stimulated and electroencephalography was used to measure somatosensory-evoked potentials. As expected, the availability of stable light touch reduced the medial-lateral centre of pressure sway. Importantly, in the present study, there was a loss of task-related P200 modulation at FCZ following stimulation of the prefrontal cortex. The present findings support the hypothesis that the prefrontal cortex may serve to regulate task-related sensory reweighting of haptic information that may be used during the control of standing balance.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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