McEvoy L K, Picton T W, Champagne S C
Human Neurosciences Research Unit, University of Ottawa, Ontario, Canada.
Ear Hear. 1991 Dec;12(6):389-98. doi: 10.1097/00003446-199112000-00003.
This article describes a technique to measure binaural integration time. A binaural noise with an interaural time difference of 0.8 msec was presented in three conditions: alone, with intervening noise that was identical between the two ears, or with uncorrelated intervening noise. Both behavioral responses and evoked potentials were recorded. When the stimulus was presented in a quiet background, it was accurately detected and lateralized with durations as short as 2 msec. The N1 peak of the evoked potential occurred at approximately 90 msec. When the stimulus occurred as a brief change in an ongoing correlated binaural noise, a duration of 10 msec was necessary before the sound could be accurately lateralized or an evoked potential elicited. The N1 peak occurred at approximately 120 msec. When the stimulus occurred as a change in an ongoing uncorrelated binaural noise, a duration of 60 msec was necessary for the subject to lateralize the stimulus and for an evoked potential to be elicited. The N1 peak occurred at about 130 msec. These results suggest that a period of approximately 60 msec is required to detect the correlation of an ongoing binaural noise and that a somewhat shorter period is necessary to track changes in a sound source that has already been lateralized. The simplicity of this technique makes it an attractive tool for assessing central auditory function.
本文描述了一种测量双耳整合时间的技术。呈现了一种双耳时间差为0.8毫秒的双耳噪声，分三种情况：单独呈现、伴有两耳间相同的介入噪声、或伴有不相关的介入噪声。同时记录了行为反应和诱发电位。当刺激在安静背景下呈现时，持续时间短至2毫秒时就能被准确检测和定位。诱发电位的N1波峰大约出现在90毫秒。当刺激作为正在进行的相关双耳噪声中的短暂变化出现时，声音能够被准确侧向定位或引出诱发电位之前需要10毫秒的持续时间。N1波峰大约出现在120毫秒。当刺激作为正在进行的不相关双耳噪声中的变化出现时，受试者对刺激进行侧向定位并引出诱发电位需要60毫秒的持续时间。N1波峰大约出现在130毫秒。这些结果表明，检测正在进行的双耳噪声的相关性大约需要60毫秒的时间，而跟踪已经侧向定位的声源的变化则需要稍短一些的时间。该技术的简单性使其成为评估中枢听觉功能的一个有吸引力的工具。
