Differences in Context and Feedback Result in Different Trajectories and Adaptation Strategies in Reaching

被引:27
作者
Arce, Fritzie [1 ,3 ]
Novick, Itai [1 ,3 ]
Shahar, Maayan [1 ,3 ]
Link, Yuval [1 ,3 ]
Ghez, Claude [4 ]
Vaadia, Eilon [1 ,2 ,3 ]
机构
[1] Hebrew Univ Jerusalem, Hadassah Med Sch, Dept Physiol, Inst Med Res Israel Canada, IL-91010 Jerusalem, Israel
[2] Interdisciplinary Ctr Neural Computat, Jerusalem, Israel
[3] Hebrew Univ Jerusalem, IL-91905 Jerusalem, Israel
[4] Columbia Univ, Coll Physicians & Surgeons, Ctr Neurobiol & Behavior, New York, NY 10027 USA
来源
PLOS ONE | 2009年 / 4卷 / 01期
基金
以色列科学基金会;
关键词
D O I
10.1371/journal.pone.0004214
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Computational models of motor control have often explained the straightness of horizontal planar reaching movements as a consequence of optimal control. Departure from rectilinearity is thus regarded as sub-optimal. Here we examine if subjects may instead select to make curved trajectories following adaptation to force fields and visuomotor rotations. Separate subjects adapted to force fields with or without visual feedback of their hand trajectory and were retested after 24 hours. Following adaptation, comparable accuracies were achieved in two ways: with visual feedback, adapted trajectories in force fields were straight whereas without it, they remained curved. The results suggest that trajectory shape is not always straight, but is also influenced by the calibration of available feedback signals for the state estimation required by the task. In a follow-up experiment, where additional subjects learned a visuomotor rotation immediately after force field, the trajectories learned in force fields (straight or curved) were transferred when directions of the perturbations were similar but not when directions were opposing. This demonstrates a strong bias by prior experience to keep using a recently acquired control policy that continues to produce successful performance inspite of differences in tasks and feedback conditions. On relearning of force fields on the second day, facilitation by intervening visuomotor rotations occurred only when required motor adjustments and calibration of feedback signals were similar in both tasks. These results suggest that both the available feedback signals and prior history of learning influence the choice and maintenance of control policy during adaptations.
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页数:12
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