Movement Disorders (revue)

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Task‐dependent modulation of silent period duration in focal hand dystonia

Identifieur interne : 000620 ( Istex/Corpus ); précédent : 000619; suivant : 000621

Task‐dependent modulation of silent period duration in focal hand dystonia

Auteurs : Cathy M. Stinear ; Winston D. Byblow

Source :

RBID : ISTEX:478B9D01DAF9260E5AFCAECB9CE721A53C307BB3

English descriptors

Abstract

Focal hand dystonia (FHD) is a movement disorder that is also associated with impaired sensory function and sensorimotor integration. The aim of this study was to assess the modulation of inhibitory function in the motor cortex during the performance of four motor tasks (isometric pinch grip, writing, texture discrimination, and a phasic control task) in 8 FHD and 8 control subjects. The affected hands of the FHD subjects and the dominant hands of the control subjects were tested. Inhibitory function was assessed using transcranial magnetic stimulation to evoke a silent period in the ongoing electromyographic activity of the target muscle (first dorsal interosseous). There was no difference between FHD subjects and control subjects in silent period duration, which was significantly longer during the phasic texture discrimination and phasic control task than during the isometric pinch or writing. This finding suggests that the phasic nature of the task may increase cortical inhibitory function, rather than the sensory discrimination task itself. The accuracy of texture discrimination was significantly lower in FHD subjects than in control subjects. Sensory discrimination tasks do not appear to directly modulate the inhibitory processes responsible for the duration of the silent period. © 2005 Movement Disorder Society

Url:
DOI: 10.1002/mds.20514

Links to Exploration step

ISTEX:478B9D01DAF9260E5AFCAECB9CE721A53C307BB3

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<title>Movement Disorders</title>
<subTitle>Official Journal of the Movement Disorder Society</subTitle>
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<titleInfo type="abbreviated">
<title>Mov. Disord.</title>
</titleInfo>
<subject>
<genre>article category</genre>
<topic>Research Article</topic>
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<identifier type="ISSN">0885-3185</identifier>
<identifier type="eISSN">1531-8257</identifier>
<identifier type="DOI">10.1002/(ISSN)1531-8257</identifier>
<identifier type="PublisherID">MDS</identifier>
<part>
<date>2005</date>
<detail type="volume">
<caption>vol.</caption>
<number>20</number>
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<detail type="issue">
<caption>no.</caption>
<number>9</number>
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<extent unit="pages">
<start>1143</start>
<end>1151</end>
<total>9</total>
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<identifier type="DOI">10.1002/mds.20514</identifier>
<identifier type="ArticleID">MDS20514</identifier>
<accessCondition type="use and reproduction" contentType="copyright">Copyright © 2005 Movement Disorder Society</accessCondition>
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<recordOrigin>Wiley Subscription Services, Inc., A Wiley Company</recordOrigin>
<recordContentSource>WILEY</recordContentSource>
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