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Trajectory formation principles are the same after mild or moderate stroke.

ABSTRACT: When we make rapid reaching movements, we have to trade speed for accuracy. To do so, the trajectory of our hand is the result of an optimal balance between feed-forward and feed-back control in the face of signal-dependant noise in the sensorimotor system. How far do these principles of trajectory formation still apply after a stroke, for persons with mild to moderate sensorimotor deficits who recovered some reaching ability? Here, we examine the accuracy of fast hand reaching movements with a focus on the information capacity of the sensorimotor system and its relation to trajectory formation in young adults, in persons who had a stroke and in age-matched control participants. We find that persons with stroke follow the same trajectory formation principles, albeit parameterized differently in the face of higher sensorimotor uncertainty. Higher directional errors after a stroke result in less feed-forward control, hence more feed-back loops responsible for segmented movements. As a consequence, movements are globally slower to reach the imposed accuracy, and the information throughput of the sensorimotor system is lower after a stroke. The fact that the most abstract principles of motor control remain after a stroke suggests that clinicians can capitalize on existing theories of motor control and learning to derive principled rehabilitation strategies.

SUBMITTER: Mottet D

PROVIDER: S-EPMC5362058 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature

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Trajectory formation principles are the same after mild or moderate stroke.

Mottet Denis D van Dokkum Liesjet Elisabeth Henriette LE Froger Jérôme J Gouaïch Abdelkader A Laffont Isabelle I

PloS one 20170322 3

When we make rapid reaching movements, we have to trade speed for accuracy. To do so, the trajectory of our hand is the result of an optimal balance between feed-forward and feed-back control in the face of signal-dependant noise in the sensorimotor system. How far do these principles of trajectory formation still apply after a stroke, for persons with mild to moderate sensorimotor deficits who recovered some reaching ability? Here, we examine the accuracy of fast hand reaching movements with a ...[more]

PMID: 28329000

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Trajectory formation principles are the same after mild or moderate stroke.

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Trajectory formation principles are the same after mild or moderate stroke.

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