Xu Z M, De Vel E, Vinck B, Van Cauwenberge P
Department of Otolaryngology, University Hospital Ghent, Belgium.
Scand Audiol. 1995;24(4):231-6. doi: 10.3109/01050399509047541.
In this study, the cross-correlation function was applied in the evaluation of MLR thresholds in the low and middle frequencies. The parameters of the cross-correlation function consist of the correlation coefficient at a lag-time of zero (RO), the maximum correlation coefficient (RM), and the latency delay on the lag-time axis at the point of the maximum correlation coefficient (DL). The normal limits of the parameters of cross-correlation at the MLR threshold level, which was identified by visual detection across frequencies, were obtained in normal-hearing and hearing-impaired subjects. The cross-correlation functions for two traces were also performed below threshold level. All cross-correlation parameters (RO, RM and DL) below threshold level were outside normal limits in 91% of all the subjects. The incidence of the only RM or DL parameter value within normal limits was 6% or 3% of all cases at the subthreshold level. Correlation data allow precise measurements of the MLR threshold and enhance the sensitivity of the definition of the MLR threshold. In addition, our study provides quantifiable information for estimating MLR threshold.
在本研究中，互相关函数被应用于评估中低频的中潜伏期反应（MLR）阈值。互相关函数的参数包括零延迟时间处的相关系数（RO）、最大相关系数（RM）以及最大相关系数点在延迟时间轴上的延迟潜伏期（DL）。通过对不同频率进行视觉检测确定MLR阈值水平时，获取了正常听力和听力受损受试者互相关参数的正常范围。在阈值水平以下也对两条迹线进行了互相关函数分析。在所有受试者中，91%的阈值水平以下的所有互相关参数（RO、RM和DL）超出正常范围。在阈下水平，仅RM或DL参数值在正常范围内的发生率分别为所有病例的6%或3%。相关数据能够精确测量MLR阈值，并提高MLR阈值定义的敏感性。此外，我们的研究为估计MLR阈值提供了可量化的信息。
