Mergner T, Hlavacka F, Schweigart G
Neurological University Clinic, Freiburg, Germany.
J Vestib Res. 1993 Spring;3(1):41-57.
The study investigates the interaction of leg proprioceptive and vestibular afferents for human self-motion perception in space. Stimulation consisted of sinusoidal (0.025-0.4 Hz) and transient horizontal rotations of trunk and head in space (vestibular stimulus, VEST) and of the feet relative to the trunk (leg proprioceptive stimulus, LEG-PROP). Measures of the perception were obtained with the help of a pointing procedure. Leg proprioception. The perception of relative motion between feet and trunk during LEG-PROP was veridical across the frequencies tested and had a low detection threshold (0.2 degree/s). Perception of trunk turning in space. Trunk turning during VEST was underestimated, especially at low frequencies, and the threshold of the perception was > or = 1.0 degree/s. LEG PROP evoked an illusion of trunk turning, which reached a considerable magnitude at low frequencies. During VEST-LEG-PROP combinations, the perception varied monotonously as a function of both inputs. Reflecting the deficiencies of its constituents, it was erroneous with 1 exception. During trunk rotation about the stationary feet, the perception was approximately veridical across frequency and its threshold was down to 0.2 degree/s, suggesting that it was determined essentially by leg proprioception in this condition. These findings resemble those previously obtained for neck proprioception and, therefore, were incorporated into a conceptual model of vestibular-proprioceptive interaction in general. In this model, first an internal notion of foot in space is created by summing the following high-threshold signals: head in space (vestibular), trunk relative to head (neck proprioceptive), and foot relative to trunk (leg proprioceptive). Second, further addition of low-threshold proprioceptive signals of trunk on foot and head on trunk yields the perception of trunk in space and head in space, respectively. Not included in the model is the finding that subjects' perceptual mode may change in certain conditions. When foot excursion exceeds a certain magnitude, for instance, vestibular input alone may determine the self-motion perception.
本研究调查腿部本体感觉传入与前庭传入在人体空间自我运动感知中的相互作用。刺激包括在空间中躯干和头部的正弦（0.025 - 0.4 Hz）和瞬态水平旋转（前庭刺激，VEST）以及双脚相对于躯干的旋转（腿部本体感觉刺激，LEG - PROP）。借助指向程序获得感知测量结果。腿部本体感觉。在LEG - PROP期间，双脚与躯干之间相对运动的感知在测试频率范围内是真实的，并且检测阈值较低（0.2度/秒）。空间中躯干转动的感知。VEST期间的躯干转动被低估，尤其是在低频时，感知阈值≥1.0度/秒。LEG PROP诱发了躯干转动的错觉，在低频时达到相当大的程度。在VEST - LEG - PROP组合期间，感知随两种输入单调变化。反映其组成部分的不足，除了1个例外情况，它是错误的。在躯干围绕固定双脚旋转期间，感知在频率范围内大致真实，其阈值降至0.2度/秒，表明在这种情况下它主要由腿部本体感觉决定。这些发现与先前关于颈部本体感觉的发现相似，因此被纳入一般前庭 - 本体感觉相互作用的概念模型中。在这个模型中，首先通过对以下高阈值信号求和来创建空间中脚的内部概念：空间中的头部（前庭）、相对于头部的躯干（颈部本体感觉）以及相对于躯干的脚（腿部本体感觉）。其次，进一步添加躯干相对于脚和头部相对于躯干的低阈值本体感觉信号，分别产生空间中躯干和空间中头部的感知。该模型未包括受试者的感知模式在某些条件下可能发生变化这一发现。例如，当足部偏移超过一定幅度时，仅前庭输入可能决定自我运动感知。
