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  4. Tuning of a Basic Coordination Pattern Constructs Straight-Ahead and Curved Walking in Humans
 
research article

Tuning of a Basic Coordination Pattern Constructs Straight-Ahead and Curved Walking in Humans

Courtine, Grégoire
•
Schieppati, Marco
2004
Journal of Neurophysiology

We tested the hypothesis that common principles govern the production of the locomotor patterns for both straight-ahead and curved walking. Whole body movement recordings showed that continuous curved walking implies substantial, limb-specific changes in numerous gait descriptors. Principal component analysis (PCA) was used to uncover the spatiotemporal structure of coordination among lower limb segments. PCA revealed that the same kinematic law accounted for the coordination among lower limb segments during both straight-ahead and curved walking, in both the frontal and sagittal planes: turn-related changes in the complex behavior of the inner and outer limbs were captured in limb-specific adaptive tuning of coordination patterns. PCA was also performed on a data set including all elevation angles of limb segments and trunk, thus encompassing 13 degrees of freedom. The results showed that both straight-ahead and curved walking were low dimensional, given that 3 principal components accounted for more than 90% of data variance. Furthermore, the time course of the principal components was unchanged by curved walking, thereby indicating invariant coordination patterns among all body segments during straight-ahead and curved walking. Nevertheless, limb- and turn-dependent tuning of the coordination patterns encoded the adaptations of the limb kinematics to the actual direction of the walking body. Absence of vision had no significant effect on the intersegmental coordination during either straight-ahead or curved walking. Our findings indicate that kinematic laws, probably emerging from the interaction of spinal neural networks and mechanical oscillators, subserve the production of both straight-ahead and curved walking. During locomotion, the descending command tunes basic spinal networks so as to produce the changes in amplitude and phase relationships of the spinal output, sufficient to achieve the body turn

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Type
research article
DOI
10.1152/jn.00817.2003
Author(s)
Courtine, Grégoire
Schieppati, Marco
Date Issued

2004

Published in
Journal of Neurophysiology
Volume

91

Issue

4

Start page

1524

End page

1535

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
UPCOURTINE  
Available on Infoscience
October 29, 2018
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/149494
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