Colloque

Relative invariants in the control of movement

Anatol Feldman

Mindy Levin

Membre a labase

Anatol Feldman

Résumé du colloque

Transformations of control signals from the movement planning level to that of motoneuronal (MN) activation and force production are described in terms of the equilibrium-point (EP) hypothesis or λ model. This model is basically associated with two stages. First, movements are produced by shifting the equilibrium state of the system via specific control variables at supraspinal and spinal levels. Second, motor behaviors are typically “specified” by constant or relatively invariant control variables at “leading” levels. Examples of relative invariants are the equilibrium velocity vector and threshold muscle lengths, λ, at which MN recruitment begins. MN threshold properties and peripheral afferent inputs are used to create a positional frame of reference for control signals at all levels of motor regulation. This frame is important for orientation-related processes in space and perception of limb position. The dynamic characteristics of the MN pool are integrated in the concept of the muscle activation model and is extended to the control of multi-joint movements by muscle afferents. Central reciprocal and coactivation commands are redefined in terms of relative invariants and generalized to multi-muscle and multi-joint systems. The model studies EMG and kinematic patterns of fast and slow single- and double-joint movements, as well as the control of limb position under changing load conditions. Finally, a solution of the redundancy and degrees of freedom of movements is elaborated.

Contexte

Section :

Génie biomédical

Thème du colloque :

Génie biomédical

Hôte : Université de Montréal

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