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

被引:16
作者
Davidson, PR
Wolpert, DM
Scott, SH
Flanagan, JR [1 ]
机构
[1] Queens Univ, Dept Psychol, Ctr Neurosci Studies, Canadian Inst Hlth Res Grp Sensory Motor Syst, Kingston, ON K7L 3N6, Canada
[2] Queens Univ, Dept Anat & Cell Biol, Ctr Neurosci Studies, Canadian Inst Hlth Res Grp Sensory Motor Syst, Kingston, ON K7L 3N6, Canada
[3] UCL, Neurol Inst, Sobell Dept Motor Neurosci, London WC1N 3BG, England
基金
英国惠康基金;
关键词
adaptation; motor learning; motor control; arm movement; sensorimotor integration; limb dynamics;
D O I
10.1523/JNEUROSCI.0429-05.2005
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
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.
引用
收藏
页码:5425 / 5429
页数:5
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