THE EFFECT OF VIEWING THE STATIC HAND PRIOR TO MOVEMENT ONSET ON POINTING KINEMATICS AND VARIABILITY
THE EFFECT OF VIEWING THE STATIC HAND PRIOR TO MOVEMENT ONSET ON POINTING KINEMATICS AND VARIABILITY
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DOI：
10.1007/bf00228753
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发表时间：
1994-09-01
影响因子：
2
通讯作者：
JEANNEROD, M
中科院分区：
文献类型：
--
作者：
ROSSETTI, Y;STELMACH, G;JEANNEROD, M
在三种条件下测量了六名人类受试者的指向准确性和手臂运动学，其中手在正在进行的运动过程中从未可见：（1）在黑暗中;（2）在目标呈现之前，静态手在周边视觉中可见，但在反应时间（H-T）期间不可见;（3）静态手在周边视觉中可见，直到运动开始（H + T）。结果表明：（1）与黑暗条件相比，在运动之前观察手降低了指向变异性。(3)同时观察手和目标（H + T）进一步降低指向的变化相比，H-T条件。这种效应与反应时间成正比。(3)观察到的减速阶段延长的运动中进行的H + T的条件下，相比，其他两个条件。(4)在HST条件下观察到变异性与减速阶段的第一部分之间呈负相关，但在H-T条件下和黑暗中都没有观察到。这些结果表明，在H + T条件下观察到的指向变异性的减少是由于基于动觉reafference的反馈。手相对于目标的初始位置的更好编码（如在H + T中）将允许臂位置感测的校准，其用于在减速阶段期间朝向目标驱动手。
Pointing accuracy and arm movement kinematics of six human subjects were measured in three conditions where the hand was never visible during the ongoing movement: (1) in the dark; (2) the static hand was seen in peripheral vision prior to target presentation, but not during the reaction time (H-T); (3) the static hand was seen in peripheral vision until movement onset (H + T). It was shown that: (1) viewing the hand prior to movement decreased pointing variability as compared to the dark condition. (3) Viewing simultaneously hand and target (H + T) further decreased pointing variability as compared to the H-T condition. This effect was proportional to the reaction time. (3) A lengthening of the deceleration phase was observed for movements performed in the H + T condition, as compared to the other two conditions. (4) A negative correlation between variability and the first part of the deceleration phase was observed in the HST condition, but neither in the H-T condition nor in the dark. These results suggest that the decrease in pointing variability observed in the H + T condition is due to a feedback based on kinesthetic reafference. Better encoding of the initial position of the hand relative to the target (as in H + T) would allow a calibration of arm position sense, which is used to drive the hand toward the target during the deceleration phase.