Sherwood David E
Department of Integrative Physiology, 354 UCB, University of Colorado, Boulder, CO 80309-0354, USA.
Percept Mot Skills. 2009 Feb;108(1):3-14. doi: 10.2466/PMS.108.1.3-14.
According to closed-loop accounts of motor control, movement errors are detected by comparing sensory feedback to an acquired reference state. Differences between the reference state and the movement-produced feedback results in an error signal which serves as a basis for a correction. The current study assessed whether error detection is less accurate when feedback from both hands must be analyzed compared to one hand and if error detection is more accurate in longer movements compared to shorter movements. 36 college-age participants (26 women and 10 men) performed a rapid aiming movement of varying distances with one hand or both hands simultaneously. Participants verbally estimated the distance moved on all trials before knowledge of results was given. Error detection was measured by the correlation and the mean absolute difference between the actual and estimated distance. Error detection was not more accurate for the longer movements, and participants underestimated errors in all conditions. Strong positive correlations were shown for both unimanual and bimanual aiming tasks, suggesting that two streams of sensory information can be processed concurrently.
根据运动控制的闭环理论，通过将感觉反馈与习得的参考状态进行比较来检测运动误差。参考状态与运动产生的反馈之间的差异会产生一个误差信号，该信号作为校正的基础。当前的研究评估了与单手相比，当必须分析双手的反馈时，误差检测的准确性是否会降低，以及与短距离运动相比，长距离运动中的误差检测是否更准确。36名大学生（26名女性和10名男性）用一只手或双手同时进行了不同距离的快速瞄准运动。在得知结果之前，参与者在所有试验中都口头估计了移动的距离。误差检测通过实际距离与估计距离之间的相关性和平均绝对差来衡量。长距离运动的误差检测并不更准确，并且参与者在所有条件下都低估了误差。单手动和双手动瞄准任务均显示出强正相关，这表明可以同时处理两种感觉信息流。
