Department of Integrative Physiology, 354 UCB, Boulder, CO 80309-0354, USA.
Percept Mot Skills. 2011 Dec;113(3):825-39. doi: 10.2466/05.24.27.PMS.113.6.825-839.
The effect of concurrent visual feedback (CVF) on continuous aiming movements was investigated in the preferred hand of participants of college age (ns = 12 men, 8 women). Participants made continuous rapid reversal movements with a lightweight lever in the sagittal plane. Participants attempted to reach a short target (20 degrees) and a long target (60 degrees) in separate constant practice conditions, but alternated between the two targets in a variable practice condition. Four blocks of practice trials were provided in each condition, with 40 movements made in each. CVF of the position-time trace was provided for the first 20 movements of each block, but was removed for the remaining 20 movements in each block. Movements were more accurate and consistent during constant practice compared to variable practice where the short target was overshot and the long target was undershot. CVF reduced errors in all conditions, compared to movements without CVF, particularly for the short target during variable practice. The results suggest that the interference generated by alternating targets can be modulated by providing visual feedback, but once the visual feedback was removed, errors increased markedly.
本研究旨在探讨伴随视觉反馈（CVF）对大学生惯用手连续瞄准运动的影响（n=12 名男性，8 名女性）。参与者在矢状面使用轻便操纵杆进行连续快速反转运动。参与者在单独的恒定练习条件下尝试达到短目标（20 度）和长目标（60 度），但在可变练习条件下交替进行。在每个条件下提供四个练习块，每个块中进行 40 次运动。在每个块的前 20 次运动中提供位置-时间轨迹的 CVF，但在每个块的后 20 次运动中去除 CVF。与可变练习相比，恒定练习中运动更准确和一致，在可变练习中，短目标过冲，长目标欠冲。与无 CVF 的运动相比，CVF 降低了所有条件下的误差，特别是在可变练习中对短目标的影响。结果表明，通过提供视觉反馈可以调节交替目标产生的干扰，但一旦去除视觉反馈，误差会显著增加。
