Accuracy of internal dynamics models in limb movements depends on stability

Experimental Brain Research
Theodore E Milner

Abstract

This study investigated the ability to use an internal model of the environmental dynamics when the dynamics were predictable but unstable. Subjects performed goal-directed movements using a robot manipulandum while counteracting a force field, which created instability by assisting the movement in proportion to hand velocity. Subjects' performance was better on the last trial than on the first trial in the force field for all four movement directions tested: out, in, right and left. Subjects adapted to the force field primarily by increasing muscle co-contraction, compared to null field movements, during all phases of movement. This co-contraction generally declined for both the deceleration and stabilization phases during the course of the first 25 movements in each direction, but tended not to decrease significantly thereafter. Catch trials at the end of the learning period suggested that increased viscoelastic impedance due to muscle co-contraction was used to counteract the force field. Only in the case of outward movements were aftereffects observed that were consistent with formation of an accurate internal model of the force field dynamics. Stabilization of the hand for outward movements required less muscle co-contract...Continue Reading

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Nov 15, 2003·Journal of Neurophysiology·David W FranklinTheodore E Milner

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Citations

Aug 4, 2005·Experimental Brain Research·Jules G BloemsaatGerard P Van Galen
Jul 28, 2010·Journal of Neurophysiology·Felix C HuangFerdinando A Mussa-Ivaldi
Apr 1, 2014·BMC Research Notes·Sumiaki MaeoHiroaki Kanehisa
Jun 18, 2005·The Journal of Physiology·Theodore E Milner, David W Franklin
Sep 12, 2015·Experimental Brain Research·Céline TardArnaud Delval
Jul 21, 2012·Physical Therapy in Sport : Official Journal of the Association of Chartered Physiotherapists in Sports Medicine·Tom Van HoofKatharina D'Herde
Feb 19, 2008·The European Journal of Neuroscience·Emmanuel GuigonMichel Desmurget
Sep 6, 2011·Neuroscience·V Yadav, R L Sainburg
Jan 30, 2007·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Andrew R ChapmanPaul W Hodges
Apr 14, 2006·Journal of Neurophysiology·Theodore E Milner, Mark R Hinder
Sep 28, 2007·Journal of Neurophysiology·Mark R Hinder, Theodore E Milner
Jan 13, 2019·Disability and Rehabilitation·Hanneke van der KrogtJurriaan H de Groot

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