Juhola M, Hirvonen T, Aalto H, Pyykkö I
Department of Computer Science and Applied Mathematics, University of Kuopio, Finland.
Comput Biomed Res. 1997 Feb;30(1):49-60. doi: 10.1006/cbmr.1997.1436.
The vestibulo-ocular reflex preserves clear vision when the head is moving fast. Measurement of the vestibulo-ocular reflex during the head autorotation test is usually calibrated using a dynamic technique in which the initial part of the eye movement signal and the corresponding part of the stimulating head movement signal are matched. Dynamic techniques can, however, be prone to generate excessively small or large calibration coefficients if a calibration segment of such a signal is corrupted by saccades or artifacts of large amplitudes. We have implemented an effective improvement for computation of difficult signals, not infrequent in clinical data, by limiting influence of distorting parts in the eye movement signal. We also discuss pitfalls of parameter accuracy concerning gain and phase parameters of the vestibulo-ocular reflex that are used to differentiate abnormal results from the normal. Furthermore, we call the ubiquituous Fast Fourier Transform method into question with regard to these signals.
当头部快速移动时，前庭眼反射可保持清晰的视力。在头部自旋转测试期间，前庭眼反射的测量通常使用动态技术进行校准，其中眼动信号的初始部分与刺激头部运动信号的相应部分相匹配。然而，如果此类信号的校准段被扫视或大幅度伪迹破坏，动态技术可能容易产生过小或过大的校准系数。我们通过限制眼动信号中失真部分的影响，对临床数据中常见的困难信号的计算进行了有效改进。我们还讨论了用于区分异常结果与正常结果的前庭眼反射增益和相位参数的参数准确性陷阱。此外，对于这些信号，我们对无处不在的快速傅里叶变换方法提出了质疑。
