Abstract
Anatol Feldman introduced his equilibrium point theory of movement control in the mid-1960’s. The theory itself has evolved in a way which is as dynamic as the neurobiomechanical states it postulates. It continuously presents challenges to the scientific community to devise focused, quantitative experimental approaches to probing the nature of posture and movement. In this paper, we analyze several forms of equilibrium point theories and the evidence that has been used to evaluate them, in terms of whether the questions are framed precisely and whether the methods are appropriate for answering the questions. Specifically, we compare studies with mechanical, contacting perturbations against studies with non-contacting, inertial perturbations, and we address the relevance of studies with deafferented animals and humans, the relevance of studies in intact humans with the “do not intervene” instruction, and factors which must be considered in predicting movement dynamics from measurements made in isometric conditions. In addition, we point out that critical studies of the dynamics of reaching behavior in experimental animals may be confusing adjustments of grip force in controlling a manipulandum with adaptive recalibration of arm movement dynamics. We conclude that the exact contribution of equilibrium point control to movement regulation has yet to be firmly established. Nevertheless, the contribution of equilibrium point theories to progress in the field is paramount.
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References
∗Asatryan, D.G., & Feldman, A.G. (1965). Functional tuning of the nervous system with control of movement or maintenance of posture. Mechanographic analysis of the work of the joint on execution of a postural task. Biophysics, 10, 925–935.
Bernstein, N. (1967). Coordination and regulation of movements. Oxford: Pergamon Press.
Bizzi, E., Accornero, N., Chapple, W. & Hogan, N. (1984). Posture control and trajectory formation during arm movement. Journal of Neuroscience, 4, 2738–2744.
∗Bizzi, E., Dev, P., Morasso, P. & Polit, A. (1978). Effect of load disturbances during centrally initiated movements. Journal of Neurophysiology, 41, 542–556.
∗Bizzi, E., Polit, A. & Morasso, P. (1976). Mechanisms underlying achievement of final head position. Journal of Neurophysiology, 39, 435–444.
Craik, K.J.W. (1947). Theory of the human operator in control systems. British journal of psychology, 38, 56–61, 142–148.
DiZio P., Frucht C. & Lackner J.R. (2005). Adaptation to a robotic force field does not transfer to free arm movements. Program No. 989.6. 2005 Abstract Viewer/Itinerary Planner. Washington, DC: Society for Neuroscience, Online.
DiZio P. & Lackner J.R. (2001). Coriolis force induced trajectory and endpoint deviations in the reaching movements of labyrinthine defective subjects. Journal of Neurophysiology, 85, 784–789.
Evarts, E.V. (1968). Relation of pyramidal tract activity to force exerted during voluntary movement. Journal of Neurophysiology, 31, 14–27.
Evarts, E.V. (1969). Activity of pyramidal tract neurons during postural fixation. Journal of Neurophysiology, 32, 375–385.
Evarts, W.V. (1973). Motor cortex reflexes associated with learned movement. Science, 179, 501–503.
Evarts, E.V. & Brooks, V.B. (1981). Role of motor cortex in voluntary movements in primates. In Handbook of Physiology (pp. 1083–1120). Bethesda, MD: American Physiology Society.
Feldman, A. & Latash, M. (2005). Testing hypotheses and the advancement of science: recent attempts to falsify the equilibrium point hypothesis. Experimental Brain Research, 161, 91–103.
Feldman, A.G. (1986). Once more on the equilibrium-point hypothesis (λ model) for motor control. Journal of Motor Behavior, 18, 17–54.
Feldman, A.G. & Levin, M.F. (1995). The origin and use of positional frames of reference in motor control. Behavioral and Brain Science, 18, 723–806.
∗Feldman, A.G. (1966a). Funtional tuning of the nervous system with control of movement or maintenance of a steady posture. Controllable parameters of the muscle. Biophysics, 11, 565–578.
∗Feldman, A.G. (1966b). Functional tuning of the nervous system during control of movement or maintenance of a steady posture. III. Mechanographic analysis of the execution by man of the simplest motor task. Biophysics, 11, 766–775.
∗Hoffer J.A. & Andreassen S. (1981). Regulation of solues muscle stiffness in premammillary cats: intrinsic and reflex components. Journal of Neurophysiology, 45, 267–285.
Hogan, N., Bizzi, E., Mussa-Ivaldi, F.A. & Flash, T. (1987). Controlling multijoint motor behavior. Exercise and Sport Sciences Reviews 15, 153–190.
∗Hudson, T.E., Lackner, J.R. & DiZio, P. (2005). Rapid adaptation of torso pointing movements to perturbations of the base of support. Experimental Brain Research, 165, 283–293.
∗Kurtzer, I., DiZio, P. & Lackner, J. (2003). Task-dependent motor learning. Experimental Brain Research, 153, 128–132.
Lackner, J.R. & DiZio, P. (1992). Rapid adaptation of arm movement endpoint and trajectory to Coriolis force perturbations. Society of Neuroscience Abstracts, 18, 515.
Lackner, J.R. & DiZio, P. (1993). Factors contributing to initial reaching errors and adaptation to Coriolis force perturbations. Society of Neuroscience Abstracts, 19, 1595.
∗Lackner, J.R. & DiZio, P. (1994). Rapid adaptation to Coriolis force perturbations of arm trajectory. Journal of Neurophysiology, 72(1), 299–313.
Lackner, J.R. & DiZio, P. (2000). Aspects of body self-calibration. Trends in Cognitive Sciences, 4, 279–288.
Lackner, J.R. & DiZio, P. (2005). Motor control and learning in altered dynamic environments. Current Opinion Neurobiology, 15(6), 653–9.
Matthews, P.B.C. (1972). Mammalian muscle receptors and their central actions. Baltimore: Williams & Wilkins.
Merton, P.A. (1953). Speculations on the servo control of movement. In Wolstenholme (ed.) The spinal cord (pp. 183–198). Boston: Little Brown.
∗Mussa-Ivaldi, F.A., Hogan, N. & Bizzi, E. (1985). Neural, mechanical and geometric factors subserving arm posture in humans. Journal of Neuroscience, 5(10), 2732–2743.
∗Pigeon, P., Bortolami, S.B., DiZio, P. & Lackner, J.R. (2003a). Coordinated turn-and-reach movements. I. Anticipatory compensation for self-generated coriolis and interaction torques. Journal of Neurophysiology, 89, 276–289.
∗Pigeon, P., Bortolami, S.B., DiZio, P. & Lackner, J.R. (2003b). Coordinated turn-and-reach movements. II. Planning in an external frame of reference. Journal of Neurophysiology, 89(1), 290–303.
Polit, A. & Bizzi, E. (1978). Processes controlling arm movements in monkeys. Science, 201, 1235–1237.
Polit, A. & Bizzi, E. (1979). Characteristics of motor programs underlying arm movements in monkeys. Journal of Neurophysiology, 42(1), 183–194.
Rothwell J.C., Traub M.M., Day B.L., Obeso J.A., Thomas P.K. & Marsden C.D. (1983). Manual motor performance in a deafferented man. Brain, 105, 515–42.
Shadmehr, R. & Mussa-Ivaldi, F. A. (1994). Adaptive representation of dynamics during learning of a motor task. Journal of Neuroscience, 14(5), 3208–3224.
∗Shadmehr, R., Mussa-Ivaldi, F. A. & Bizzi, E. (1993). Postural force fields of the human arm and their role in generating multi-joint movements. Journal of Neuroscience, 13, 45–62.
St-Onge, N. & Feldman, A. (2004). Referent configuration of the body: a global factor in the control of multiple skeletal muscles. Experimental Brain Research, 155, 291–300.
The references marked with an asterisk (∗) are specifically recommended for further introduction or background to the topic.
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Lackner, J.R., DiZio, P. (2009). Control and Calibration of Multi-Segment Reaching Movements. In: Sternad, D. (eds) Progress in Motor Control. Advances in Experimental Medicine and Biology, vol 629. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-77064-2_37
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DOI: https://doi.org/10.1007/978-0-387-77064-2_37
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