机械乳突振动时阈级全身运动的感知。
Perception of threshold-level whole-body motion during mechanical mastoid vibration.
机构信息
Department of Health and Human Performance, University of Houston, Houston, TX, USA.
Center for Neuromotor and Biomechanics Research, University of Houston, Houston, TX, USA.
出版信息
J Vestib Res. 2018;28(3-4):283-294. doi: 10.3233/VES-180636.
BACKGROUND
Vibration applied on the mastoid has been shown to be an excitatory stimulus to the vestibular receptors, but its effect on vestibular perception is unknown.
OBJECTIVE
Determine whether mastoid vibration affects yaw rotation perception using a self-motion perceptual direction-recognition task.
METHODS
We used continuous, bilateral, mechanical mastoid vibration using a stimulus with frequency content between 1 and 500 Hz. Vestibular perception of 10 healthy adults (M±S.D. = 34.3±12 years old) was tested with and without vibration. Subjects repeatedly reported the perceived direction of threshold-level yaw rotations administered at 1 Hz by a motorized platform. A cumulative Gaussian distribution function was fit to subjects' responses, which was described by two parameters: bias and threshold. Bias was defined as the mean of the Gaussian distribution, and equal to the motion perceived on average when exposed to null stimuli. Threshold was defined as the standard deviation of the distribution and corresponded to the stimulus the subject could reliably perceive.
RESULTS
The results show that mastoid vibration may reduce bias, although two statistical tests yield different conclusions. There was no evidence that yaw rotation thresholds were affected.
CONCLUSIONS
Bilateral mastoid vibration may reduce left-right asymmetry in motion perception.
背景
已经证明，施加于耳廓后的振动对前庭感受器具有兴奋性刺激作用，但它对前庭感知的影响尚不清楚。
目的
使用自身运动感知方向识别任务，确定乳突振动是否会影响偏航旋转感知。
方法
我们使用频率在 1 至 500Hz 之间的连续双侧机械乳突振动。10 名健康成年人（M±S.D. = 34.3±12 岁）在有和没有振动的情况下接受了测试。通过电动平台施加 1Hz 的阈下偏航旋转，受试者反复报告感知到的方向。使用累积高斯分布函数拟合受试者的反应，该函数由两个参数描述：偏差和阈值。偏差定义为高斯分布的平均值，等于暴露于零刺激时平均感知到的运动。阈值定义为分布的标准差，对应于受试者可以可靠感知的刺激。
结果
结果表明，乳突振动可能会降低偏差，尽管两种统计检验得出了不同的结论。没有证据表明偏航旋转阈值受到影响。
结论
双侧乳突振动可能会减少运动感知中的左右不对称性。
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