Control processes underlying elbow flexion movements may be independent of kinematic and electromyographic patterns: experimental study and modelling

Neuroscience
N St-OngeA G Feldman

Abstract

Using a non-linear dynamic model based on the lambda version of the equilibrium-point hypothesis, we investigated the shape and duration of the control patterns underlying discrete elbow movements. The model incorporates neural control variables, time-, position- and velocity-dependent intrinsic muscle and reflex properties. Two control variables (R and C) specify a positional frame of reference for activation of flexor and extensor motoneurons. The variable R (reciprocal command) specifies the referent joint angle (R) at which the transition of net flexor to extensor active torque or vice versa can be observed during changes in the actual joint angle elicited by an external force. The variable C (coactivation command) surrounds the transition angle by an angular range in which flexor and extensor muscles may be simultaneously active (if C > 0) or silent (if C < or = 0). An additional, time-dimensional control variable (mu command) influences the dependency of the threshold of the stretch reflex on movement velocity. This control variable is responsible for the reflex damping. Changes in the R command result in shifts in the equilibrium state of the system, a dynamical process leading to electromyographic modifications and move...Continue Reading

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Citations

Oct 19, 2004·Experimental Brain Research·Anatol G Feldman, Mark L Latash
Feb 4, 2005·Experimental Brain Research·Roberto EspostiFausto Baldissera
Apr 28, 2005·Experimental Brain Research·Philippe S ArchambaultAnatol G Feldman
May 6, 2006·Experimental Brain Research·Jean-François Pilon, Anatol G Feldman
Mar 7, 2007·Experimental Brain Research·Jean-François PilonAnatol G Feldman
Dec 17, 2008·Experimental Brain Research·Anatol G Feldman
Sep 23, 2009·Experimental Brain Research·Fang Yang, Anatol G Feldman
Jun 29, 2011·Biological cybernetics·A V Alexandrov, A A Frolov
May 2, 2002·Human Movement Science·Marc H E de LussanetEli Brenner
Jul 21, 2007·International Journal of Neural Systems·L Lan, K Y Zhu
Dec 4, 2009·Journal of Neurophysiology·A G Vidal-GadeaP L Newland
May 26, 2005·Perception & Psychophysics·James R Tresilian
Nov 14, 2012·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Aditi A MullickMindy F Levin
Jun 19, 2007·The European Journal of Neuroscience·Emmanuel GuigonMichel Desmurget
May 1, 2011·Wiley Interdisciplinary Reviews. Cognitive Science·Anatol G Feldman
Feb 18, 2015·Frontiers in Integrative Neuroscience·Isaac L Kurtzer
Nov 27, 2014·Frontiers in Computational Neuroscience·Thomas Buhrmann, Ezequiel A Di Paolo
Apr 2, 2014·Journal of Speech, Language, and Hearing Research : JSLHR·Mohammad Ali NazariYohan Payan
Jan 27, 2006·Journal of Neurophysiology·Dinant A KistemakerMaarten F Bobbert
Jul 7, 2007·Journal of Neurophysiology·Dinant A KistemakerMaarten F Bobbert
Oct 26, 1999·Motor Control·S Morrison, J G Anson
Sep 2, 2000·Motor Control·M B Shapiro, R V Kenyon

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