Seidman Scott H, Au Yong Nicholas, Paige Gary D
Department Biomedical Engineering, University of Rochester, Rochester, New York, USA.
Ann N Y Acad Sci. 2009 May;1164:222-8. doi: 10.1111/j.1749-6632.2009.03771.x.
In response to translations of the head, the linear vestibulo-ocular reflex (LVOR) produces compensatory eye movements that are high-pass in nature, with a declining response magnitude and an increasing phase lead with declining stimulus frequency. Perception of head translation, however, is reported to be robust at much lower frequency than predicted by the LVOR, causing speculation that the vestibular processing underlying reflex and perceptual responses are different. Direct comparison of these two responses across a large frequency range proves problematic, in part because of difficulties encountered in the assessment of perception at high frequency, and confounding variables at low frequency. We used innovative techniques to measure psychophysical responses to translation, and find strong similarity to the LVOR. These include experiments in which motion cues were limited to those of an inertial nature, and conclude that the vestibular system comprises only one input to perceptual mechanisms related to linear motion, and this is supplemented (particularly at low frequency) by somatic and cognitive cues.
针对头部平移，线性前庭眼反射（LVOR）会产生补偿性眼动，这种眼动本质上是高通的，随着刺激频率降低，反应幅度下降且相位超前增加。然而，据报道，头部平移的感知在比LVOR预测的频率低得多的情况下依然稳健，这引发了一种推测，即反射和感知反应背后的前庭处理是不同的。在较大频率范围内直接比较这两种反应存在问题，部分原因是在高频时评估感知存在困难，以及低频时存在混杂变量。我们使用创新技术来测量对平移的心理物理反应，并发现其与LVOR有很强的相似性。这些实验包括将运动线索限制在惯性性质的线索，得出的结论是，前庭系统只是与线性运动相关的感知机制的一个输入，并且（特别是在低频时）由躯体和认知线索进行补充。
