Changes in control of eye movement and upper limb movement with automatization of postural control during floor vibration

我们研究了在地板振动过程中，随着姿势控制的自动化，眼球运动和上肢运动控制的变化。受试者均为健康大学生，均无地板振动经历。眼动采用扫视眼动(S组，n=9)和平稳追赶眼动(P组，n=10)。上肢运动采用反应运动(R组，n=10)和跟踪运动(T组，n=10)。在振幅值为2.5 cm、频率为0.5 Hz的条件下，对装有测力平台的振动台进行了前后正弦振动。一个可视目标被呈现在面部贴装显示器上。分别用眼电技术和由上肢控制的电位器电信号采集眼球和上肢的运动。对于T组，一个跟踪视觉目标的点，由电位器…的电信号控制面部贴装显示屏上展示了更多内容。S组和R组视靶交替左右移动2~4个S，P组和T组在0.3 Hz条件下水平水平正弦运动。视角设置为20度。每个动作的眼球运动或上肢运动在训练结束后被测量(对照)。之后，地板振动1分钟，重复11次。在第1次和第11次试验中同时进行眼球运动或上肢运动，所有受试组的足底中心压力波动的平均速度在最初试验时有所下降，但此后一直保持到第10次试验。除S组外，其余受试组第11次测试的平均速度均显著高于第10次实验。T组的这种增加明显大于R组。在第1次实验中，仅S组的眼动表现低于对照组和第11次实验。在R组和T组的上肢运动表现中也发现了类似的现象。这些结果表明：(1)同时进行眼动或上肢运动的姿势控制随着姿势控制自动化程度的提高而提高；(2)当更随意的动作与姿势控制同时进行时，会产生较大的干扰。较少

We investigated changes in control of the eye movement and upper limb movement with automatization of postural control during floor vibration. The subjects were healthy university students, all of them had no experience of floor vibration. The saccadic eye movement (S-group, n=9) and smooth pursuit eye movement (P-group, n=10) were adopted as the eye movement. The reaction movement (R-group, n=10) and tracking movement (T-group, n=10) were adopted as the upper limb movement. A vibration table mounted with a force platform was vibrated sinusoidaly in anteroposterior direction under the condition of 2.5 cm amplitude and 0.5 Hz frequency. A visual target was presented on a face mounting display. The movement of the eye and upper limb were picked up using the electro-oculogram technique and electric signal of a potentiometer that was controlled by the upper limb, respectively. For T-group, a spot for following the visual target, which was controlled by the electric signal of potentiometer, … More was presented on the face mounting display. The visual target was alternately moved toward left and right for random durations of 2-4 s for S- and R-groups, and was moved sinusoidaly in horizontal level under the condition of 0.3 Hz for P- and T-groups. A visual angle was set at 20 degree. The eye movement or upper limb movement was measured (Control) after the training session for each movement. After that the floor vibration for 1 minute was repeated 11 times. The eye movement or upper limb movement was simultaneously performed in the 1st and llth trials.For all subject-groups, the mean speed of the fluctuation of center of foot pressure decreased in initial trials, while after that it was constantly maintained till the 10th trial. The mean speed in the llth trial was significantly increased relative to that in the 10th trial for all subject-groups except S-group. This increase was significantly greater for T-group than for R-group. The eye movement performance of the 1st trial in only for S-group was inferior to that of Control and the llth trial. A similar phenomenon was found in the performance of the upper limb movement for R- and T-groups. These results suggest that (1) simultaneous postural control with the eye movement or the upper limb movement improves with automatization of postural control, (2) the large interference occurs when the more voluntary movement was simultaneously performed with postural control. Less