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Tytuł pozycji:

Common encoding of novel dynamic loads applied to the hand and arm.

Tytuł :
Common encoding of novel dynamic loads applied to the hand and arm.
Autorzy :
Davidson PR; Department of Psychology, Canadian Institutes of Health Research Group in Sensory-Motor Systems, Centre for Neuroscience Studies, Queen's University, Kingston, Ontario, Canada K7L 3 N6.
Wolpert DM
Scott SH
Flanagan JR
Pokaż więcej
Źródło :
The Journal of neuroscience : the official journal of the Society for Neuroscience [J Neurosci] 2005 Jun 01; Vol. 25 (22), pp. 5425-9.
Typ publikacji :
Journal Article; Research Support, Non-U.S. Gov't
Język :
English
Imprint Name(s) :
Publication: Washington, DC : Society for Neuroscience
Original Publication: [Baltimore, Md.] : The Society, c1981-
MeSH Terms :
Learning*
Movement*
Arm/*physiology
Hand/*physiology
Adult ; Elbow Joint/physiology ; Hand Joints/physiology ; Humans ; Motor Cortex/physiology ; Motor Skills ; Robotics ; Shoulder Joint/physiology ; Somatosensory Cortex/physiology ; Torque
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Grant Information :
United Kingdom Wellcome Trust
Entry Date(s) :
Date Created: 20050603 Date Completed: 20060302 Latest Revision: 20200225
Update Code :
20210210
PubMed Central ID :
PMC6725001
DOI :
10.1523/JNEUROSCI.0429-05.2005
PMID :
15930392
Czasopismo naukowe
In manual action, the relationship between a given motor command and the ensuing movement depends on the dynamics of both the arm and hand-held objects. Skilled performance relies on the brain learning both these dynamics, and previous studies have examined how people adapt to novel loads applied to either the hand or the arm. In this study, we ask whether these different kinds of load are represented independently as a result of changes in cutaneous feedback and hand-arm coordination. We used a robotic apparatus that could either apply forces to an object held in the subject's hand or directly to the segments of the arm. We tested whether subjects could retain learning of a force field applied to the hand after subsequently experiencing the opposing field applied to the arm (or vice versa), or whether retrograde interference would be observed. In separate experiments, we used force fields and torque fields that were linearly related to either hand or joint velocities, respectively. Our finding of complete interference between opposing fields suggests that loads applied to the arm and hand are not represented independently by the sensorimotor system. This interference occurred despite markedly different cutaneous inputs that were directly related to the movement task. This result suggests that the brain represents dynamics independently of these sensory inputs. In addition, we found that the rate at which subjects adapted to a given force field, specified either in hand or joint coordinates, was independent of whether the forces were applied to the hand or arm segments.

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