Abstract
The maintenance of balance while sitting or standing requires a control mechanism which can maintain upright posture as well as adapt quickly and flexibly to changes in the environment. Some sort of dynamical control must link visual, auditory, vestibular, and proprioceptive perceptual input to the motoric responses required to activate appropriate muscle groups in order to maintain balance. This dynamical control mechanism needs to use perceptual input to predict the future state of posture with respect to the environment if adaptive balance is to be maintained under changing conditions. These constraints suggest that a purely stochastic random-walk postural control system is unlikely, although others have been unable to reject a linear stochastic model for postural control of quiet standing.
The data presented in this chapter are drawn from an experiment that measures center of pressure in a sample of sitting infants who are exposed to a “moving room” stimulus paradigm. Three categories of analyses are applied to these data: mutual information, false nearest neighbors and surrogate data tests. These techniques will be applied to ask whether the center of pressure in sitting infants’ postural control can be modeled as a linear system, whether there is a developmental change in the strength and direction of the coupling of that postural control to visual stimuli and whether any developmental change observed in this coupling carries an accompanying reduction in noise in center of pressure.
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Boker, S.M., Schreiber, T., Pompe, B., Bertenthal, B.I. (1998). Nonlinear Analysis of Perceptual-Motor Coupling in the Development of Postural Control. In: Kantz, H., Kurths, J., Mayer-Kress, G. (eds) Nonlinear Analysis of Physiological Data. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-71949-3_15
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DOI: https://doi.org/10.1007/978-3-642-71949-3_15
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