Trial-to-Trial Reoptimization of Motor Behavior Due to Changes in Task Demands Is Limited
Identifieur interne : 001740 ( Main/Merge ); précédent : 001739; suivant : 001741Trial-to-Trial Reoptimization of Motor Behavior Due to Changes in Task Demands Is Limited
Auteurs : Jean-Jacques Orban De XivrySource :
- PLoS ONE [ 1932-6203 ] ; 2013.
Abstract
Each task requires a specific motor behavior that is tuned to task demands. For instance, writing requires a lot of accuracy while clapping does not. It is known that the brain adjusts the motor behavior to different task demands as predicted by optimal control theory. In this study, the mechanism of this reoptimization process is investigated by varying the accuracy demands of a reaching task. In this task, the width of the reaching target (0.5 or 8 cm) was varied either on a trial-to-trial basis (random schedule) or in blocks (blocked schedule). On some trials, the hand of the subjects was clamped to a rectilinear trajectory that ended 2 cm on the left or right of the target center. The rejection of this perturbation largely varied with target width in the blocked schedule but not in the random schedule. That is, subjects exhibited different motor behavior in the different schedules despite identical accuracy demands. Therefore, while reoptimization has been considered immediate and automatic, the differences in motor behavior observed across schedules suggest that the reoptimization of the motor behavior is neither happening on a trial-by-trial basis nor obligatory. The absence of trial-to-trial mechanisms, the inability of the brain to adapt to two conflicting task demands and the existence of a switching cost are discussed as possible sources of the non-optimality of motor behavior during the random schedule.
Url:
DOI: 10.1371/journal.pone.0066013
PubMed: 23776593
PubMed Central: 3679014
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Trial-to-Trial Reoptimization of Motor Behavior Due to Changes in Task Demands Is Limited</title><author><name sortKey="De Xivry, Jean Jacques Orban" sort="De Xivry, Jean Jacques Orban" uniqKey="De Xivry J" first="Jean-Jacques Orban" last="De Xivry">Jean-Jacques Orban De Xivry</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">23776593</idno><idno type="pmc">3679014</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3679014</idno><idno type="RBID">PMC:3679014</idno><idno type="doi">10.1371/journal.pone.0066013</idno><date when="2013">2013</date><idno type="wicri:Area/Pmc/Corpus">002278</idno><idno type="wicri:Area/Pmc/Curation">002278</idno><idno type="wicri:Area/Pmc/Checkpoint">000F23</idno><idno type="wicri:Area/Ncbi/Merge">002748</idno><idno type="wicri:Area/Ncbi/Curation">002748</idno><idno type="wicri:Area/Ncbi/Checkpoint">002748</idno><idno type="wicri:Area/Main/Merge">001740</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Trial-to-Trial Reoptimization of Motor Behavior Due to Changes in Task Demands Is Limited</title><author><name sortKey="De Xivry, Jean Jacques Orban" sort="De Xivry, Jean Jacques Orban" uniqKey="De Xivry J" first="Jean-Jacques Orban" last="De Xivry">Jean-Jacques Orban De Xivry</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author></analytic><series><title level="j">PLoS ONE</title><idno type="eISSN">1932-6203</idno><imprint><date when="2013">2013</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Each task requires a specific motor behavior that is tuned to task demands. For instance, writing requires a lot of accuracy while clapping does not. It is known that the brain adjusts the motor behavior to different task demands as predicted by optimal control theory. In this study, the mechanism of this reoptimization process is investigated by varying the accuracy demands of a reaching task. In this task, the width of the reaching target (0.5 or 8 cm) was varied either on a trial-to-trial basis (random schedule) or in blocks (blocked schedule). On some trials, the hand of the subjects was clamped to a rectilinear trajectory that ended 2 cm on the left or right of the target center. The rejection of this perturbation largely varied with target width in the blocked schedule but not in the random schedule. That is, subjects exhibited different motor behavior in the different schedules despite identical accuracy demands. Therefore, while reoptimization has been considered immediate and automatic, the differences in motor behavior observed across schedules suggest that the reoptimization of the motor behavior is neither happening on a trial-by-trial basis nor obligatory. The absence of trial-to-trial mechanisms, the inability of the brain to adapt to two conflicting task demands and the existence of a switching cost are discussed as possible sources of the non-optimality of motor behavior during the random schedule.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Nashed, Jy" uniqKey="Nashed J">JY Nashed</name></author><author><name sortKey="Crevecoeur, F" uniqKey="Crevecoeur F">F Crevecoeur</name></author><author><name sortKey="Scott, Sh" uniqKey="Scott S">SH Scott</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Knill, Dc" uniqKey="Knill D">DC Knill</name></author><author><name sortKey="Bondada, A" uniqKey="Bondada A">A Bondada</name></author><author><name sortKey="Chhabra, M" uniqKey="Chhabra M">M Chhabra</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Todorov, E" uniqKey="Todorov E">E Todorov</name></author><author><name 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