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dc.contributor.authorReppert, Thomas R. ( Orcid Icon 0000-0002-7089-1852 )
dc.contributor.authorRigas, Ioannis ( )
dc.contributor.authorHerzfeld, David J. ( Orcid Icon 0000-0001-9910-0658 )
dc.contributor.authorSedaghat-Nejad, Ehsan ( Orcid Icon 0000-0001-6732-1296 )
dc.contributor.authorKomogortsev, Oleg ( )
dc.contributor.authorShadmehr, Reza ( Orcid Icon 0000-0002-7686-2569 )
dc.date.accessioned2019-08-28T14:59:21Z
dc.date.available2019-08-28T14:59:21Z
dc.date.issued2018-08
dc.identifier.citationReppert, T. R., Rigas, I., Herzfeld, D. J., Sedaghat-Nejad, E., Komogortsev, O., & Shadmehr, R. (2018). Movement vigor as a traitlike attribute of individuality. Journal of Neurophysiology, 120(2), pp. 741–757.en_US
dc.identifier.urihttps://digital.library.txstate.edu/handle/10877/8556
dc.description.abstract

A common aspect of individuality is our subjective preferences in evaluation of reward and effort. The neural circuits that evaluate these commodities influence circuits that control our movements, raising the possibility that vigor differences between individuals may also be a trait of individuality, reflecting a willingness to expend effort. In contrast, classic theories in motor control suggest that vigor differences reflect a speed-accuracy trade-off, predicting that those who move fast are sacrificing accuracy for speed. Here we tested these contrasting hypotheses. We measured motion of the eyes, head, and arm in healthy humans during various elementary movements (saccades, head-free gaze shifts, and reaching). For each person we characterized their vigor, i.e., the speed with which they moved a body part (peak velocity) with respect to the population mean. Some moved with low vigor, while others moved with high vigor. Those with high vigor tended to react sooner to a visual stimulus, moving both their eyes and arm with a shorter reaction time. Arm and head vigor were tightly linked: individuals who moved their head with high vigor also moved their arm with high vigor. However, eye vigor did not correspond strongly with arm or head vigor. In all modalities, vigor had no impact on end-point accuracy, demonstrating that differences in vigor were not due to a speed-accuracy trade-off. Our results suggest that movement vigor may be a trait of individuality, not reflecting a willingness to accept inaccuracy but demonstrating a propensity to expend effort.

NEW & NOTEWORTHY A common aspect of individuality is how we evaluate economic variables like reward and effort. This valuation affects not only decision making but also motor control, raising the possibility that vigor may be distinct between individuals but conserved across movements within an individual. Here we report conservation of vigor across elementary skeletal movements, but not eye movements, raising the possibility that the individuality of our movements may be driven by a common neural mechanism of effort evaluation across modalities of skeletal motor control.

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dc.formatText
dc.format.extent17 pages
dc.format.medium1 file (.pdf)
dc.language.isoen_USen_US
dc.publisherAmerican Physiological Societyen_US
dc.sourceJournal of Neurophysiology, 2018, Vol. 120, No. 2, pp. 741–757
dc.subjectBasal gangliaen_US
dc.subjectEffort
dc.subjectMovement vigor
dc.subjectReward
dc.subjectSpeed-accuracy trade-off
dc.titleMovement Vigor as a Traitlike Attribute of Individualityen_US
txstate.documenttypeArticle
dc.description.versionThis is the accepted manuscript version of an article published in the Journal of Neurophysiology.
dc.identifier.doihttps://doi.org/10.1152/jn.00033.2018
txstate.departmentComputer Science


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