论文部分内容阅读
用听觉诱发电位的方法测定听觉阈值具有客观性的优点,但这首先要确定究竟有没有反应,传统上多用迭加法,而本文则采用模式分析法。这一方法的出发点是,重复进行阈上刺激在每个刺激后记录的随机脑电背景上一定会诱发出可资比较的模式来。为此先用60次刺激(每次用强度明显超过受试者阈值之上的纯音40毫秒)得出相关平均诱发电位作为参考。所有的数据都经过低通滤波(fc=40Hz)。对每段刺激后记录(0.64秒)都算出它和同一受试者相关乎均诱发电位之间的相关系数。对15名有正常听力
The method of auditory evoked potentials to determine the auditory threshold has the advantage of objectivity, but first of all to determine whether there is no response, the traditional use of superposition method, and this article is the use of pattern analysis. The starting point for this approach is that repeated suprathreshold stimuli will induce a comparable pattern on a random EEG background recorded after each stimulus. For this purpose, the average of the relevant evoked potentials was used as a reference with 60 stimuli (each time with a pure tone 40 milliseconds in intensity that clearly exceeded the threshold of the subject). All data is low-pass filtered (fc = 40Hz). For each post-stimulation recording (0.64 seconds), a correlation coefficient was calculated between it and the evoked potential associated with the same subject. 15 normal hearing