O'Leary D P
Department of Otolaryngology-Head and Neck Surgery, University of Southern California, School of Medicine, Los Angeles 90033.
Rev Laryngol Otol Rhinol (Bord). 1992;113(5):407-12.
The vestibulo-ocular reflex (VOR) is most active at higher frequencies (> 2 Hz) during locomotion, in order to stabilize vision. Use of active head movements, monitored by a sensor on a head strap, is a new method of testing the horizontal and vertical VORs which utilizes this natural frequency range, and doesn't require a rotating chair. Specialized computer processing based on Fourier analysis is necessary to analyze head and eye signals, which can be erratic. Higher harmonics of these erratic movements are particularly useful for VOR testing, in the analogous sense that complex sound processing is necessary for speech processing in audition. Use of portable computers with VOR active head analysis can be done at the bedside, as a portable vestibular test. Sophisticated software can effectively substitute for rotating chair hardware, provided that physiological corrections are applied to actively-generated movements at higher frequencies. In summary, the resulting test is brief, comfortable to the patient, portable, and useful for diagnostic screening over the frequency range that is most active during common daily movements.
前庭眼反射（VOR）在运动过程中，为稳定视觉，在较高频率（>2Hz）时最为活跃。利用头带上的传感器监测主动头部运动，是一种测试水平和垂直VOR的新方法，该方法利用了这个自然频率范围，且不需要转椅。基于傅里叶分析的专门计算机处理对于分析头部和眼睛信号是必要的，这些信号可能不稳定。这些不稳定运动的高次谐波对于VOR测试特别有用，类似于在听觉中语音处理需要复杂的声音处理。使用带有VOR主动头部分析功能的便携式计算机可以在床边进行，作为一种便携式前庭测试。只要对高频主动产生的运动进行生理校正，复杂的软件就能有效地替代转椅硬件。总之，由此产生的测试简短、患者舒适、便于携带，并且对于在日常常见运动中最活跃的频率范围内进行诊断筛查很有用。
