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The internal model and the leading joint hypothesis: implications for control of multi-joint movements

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Abstract

This article presents a theoretical generalization of recent experimental findings accumulated in support of two concepts of inter-segmental dynamics regulation during multi-joint movements. The concepts are the internal model of inter-segmental dynamics and the leading joint hypothesis (LJH). The internal model of limb dynamics is a well-established interpretation of feed-forward control. Recent experiments have generated new information about the organization of the internal model and its role in regulation of inter-segmental dynamics. The LJH, which proposes a simplified principle of the regulation of inter-segmental dynamics, is at the beginning stage of development. This paper outlines major results obtained in these two research directions and demonstrates that the two groups of findings complement and augment each other, suggesting a simple and robust hierarchical strategy of multi-joint movement control that exploits specific mechanical properties of human limbs.

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Notes

  1. In the latest interpretations, the inputs of lookup tables include the movement trajectory together with a neighborhood of the trajectory in the trajectory manifold (Poggio and Bizzi 2004). Possible implementation of this principle is Gaussian tuning of the trajectory (Thoroughman and Shadmehr 2000)

  2. If novel inter-segmental dynamics are practiced and structured algorithms are available for only a limited number of discrete locations in the intrinsic space, motion in intermediate locations may be performed with use of interpolation of the constant estimates of A and B obtained for neighboring structured algorithms (Malfait et al. 2005).

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Acknowledgments

I thank Y. Shimansky and the two anonymous reviewers for helpful suggestions on the manuscript. The study was supported by NIH grant NS 43502.

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Dounskaia, N. The internal model and the leading joint hypothesis: implications for control of multi-joint movements. Exp Brain Res 166, 1–16 (2005). https://doi.org/10.1007/s00221-005-2339-1

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