Vestibular stimulation perturbs human stance also at higher frequencies.
Vestibular stimulation perturbs human stance also at higher frequencies.
复制标题
前庭刺激也会以更高的频率扰乱人类的姿态。
DOI：
10.3109/00016489509125294
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Rolf Johansson
中科院分区：
文献类型：
--
作者：
H. Petersen;M. Magnusson;P. Fransson;Rolf Johansson
采用双耳刺激前庭神经的方法，对11名健康受试者进行了前庭功能障碍对姿势控制的影响。刺激由30个S正弦电流组成，频率分别为0.2，0.3，0.5，1.0，1.5，2.0，3.0和4.0赫兹，电流为+/-1 mA，受试者睁眼或闭眼站立，用测力台记录诱发的反应。与静止值(即无刺激)相比，在闭眼状态下的所有测试频率和睁眼状态下的0.2、0.5、1.0、3.0和4.0 Hz频率下，身体横向晃动的方差均显著增大；使用截止频率为0.1 Hz的高通滤波器时，闭眼状态下的身体侧向晃动的方差在0.2、0.3、0.5、1.0和2.0 Hz处以及睁眼状态下的0.5和2.0 Hz频率下显著增大。这些发现表明，在外侧平面，前庭输入影响并可能在更大的频率范围内影响人类的姿势控制，而不是先前研究中的发现。此外，视觉贡献似乎使受试者能够抑制前庭输入，仅在较低的频率范围内(这里是0.2和0.3赫兹)抑制导致身体横向摆动的输入。前庭对侧平面姿势控制作用的这一证据与前庭-眼反射的反应特征一致。
The effect of primary vestibular disturbance on postural control was investigated in 11 normal subjects exposed to perturbation by bi-polar binaural galvanic stimulation of the vestibular nerve. The stimulus consisted of 30 s of sinusoidal galvanic stimulation at frequencies of 0.2, 0.3, 0.5, 1.0, 1.5, 2.0, 3.0 and 4.0 Hz, with a current of +/- 1 mA, the subject standing with open or closed eyes and the response evoked being recorded with a force platform. As compared with resting values, i.e. no stimuli, variance of lateral body sway was significantly greater at all frequencies tested in the closed eyes condition and at frequencies of 0.2, 0.5, 1.0, 3.0 and 4.0 Hz in the open eyes condition; using a high pass filter with a cut-off frequency of 0.1 Hz, variance of lateral body sway was significantly greater at frequencies 0.2, 0.3, 0.5, 1.0 and 2.0 Hz in the closed eyes condition and at frequencies 0.5 and 2.0 Hz in the open eyes condition. These findings suggest that in the lateral plane vestibular input affects and probably contributes to human postural control over a wider frequency range than suggested by findings in previous studies. Moreover, the visual contribution appears to enable the subject to suppress vestibular input causing lateral body sway only in the lower frequency range (here at 0.2 and 0.3 Hz). This evidence of vestibular contribution to postural control in the lateral plane is consistent with the response characteristics of the vestibulo-ocular reflex.