Effects of displacement and trajectory length on the variability pattern of reaching movements

dc.creatorJaric, S
dc.creatorFerreira, SMS
dc.creatorTortoza, C
dc.creatorMarconi, NF
dc.creatorAlmeida, GL
dc.date1999
dc.dateDEC
dc.date2014-12-02T16:28:29Z
dc.date2015-11-26T16:36:52Z
dc.date2014-12-02T16:28:29Z
dc.date2015-11-26T16:36:52Z
dc.date.accessioned2018-03-28T23:19:43Z
dc.date.available2018-03-28T23:19:43Z
dc.identifierJournal Of Motor Behavior. Heldref Publications, v. 31, n. 4, n. 303, n. 308, 1999.
dc.identifier0022-2895
dc.identifierWOS:000083842500001
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/64144
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/64144
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/64144
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1271918
dc.descriptionThe design of the present study enabled the authors to distinguish between the possible effects of movement displacement and trajectory length on the pattern of final positions of planar reaching movements. With their eyes closed, 9 subjects performed series of fast and accurate movements from different initial positions to the same target. For some series, the movements were unconstrained and were therefore performed along an approximately straight vertical line. For other series, an obstacle was positioned so that trajectory length was increased because of an increase in movement curvature. Ellipses of variability obtained by means of principal component analysis applied to the scatter of movement final positions enabled the authors to assess the pattern of movement variable errors. The results showed that the orientation of the ellipses was not affected by movement displacement or by trajectory length, whereas variable errors increased with move ment displacement. An increase in trajectory length as a consequence of increased curvature caused no change in variable error. From the perspective of current motor control theory, that finding was quite unexpected. Further studies are required so that one can distinguish among the possible effects of various kinematics, kinetics, and other variables that could affect the pattern of variable errors of reaching movements.
dc.description31
dc.description4
dc.description303
dc.description308
dc.languageen
dc.publisherHeldref Publications
dc.publisherWashington
dc.publisherEUA
dc.relationJournal Of Motor Behavior
dc.relationJ. Mot. Behav.
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectdisplacement
dc.subjecterror
dc.subjecthuman
dc.subjectreaching movements
dc.subjecttrajectory length
dc.subject3-dimensional Space
dc.subjectDirection
dc.subjectTargets
dc.subjectExtent
dc.subjectTask
dc.titleEffects of displacement and trajectory length on the variability pattern of reaching movements
dc.typeArtículos de revistas


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