Champlin C A
Department of Speech Communication, University of Texas, Austin 78712.
Hear Res. 1992 Feb;58(1):63-9. doi: 10.1016/0378-5955(92)90009-c.
Auditory steady-state potentials were recorded from the scalp of adult humans. The stimuli were 100-microseconds clicks presented at a rate of 39.1/s. Four stimulus levels were used (-20, 0, 10, and 20 dB SL). The presence or absence of a response was determined by three frequency-domain methods and examiners. The frequency-domain methods were: magnitude-squared coherence (MSC), phase coherence (PC), and magnitude only (MO). The MSC method generally had the highest d' values, indicating that it was the most sensitive method for detecting responses. The hearing threshold predicted by the MSC method was the lowest, and it was within 4 dB of the behaviorally measured threshold for the click stimuli. Further, the amplitude of the response was significantly more variable than its phase, and no relation was found between the variability of the amplitude of the response and the amplitude of the noise. In summary, response detection methods that incorporate phase information (such as MSC and PC) should be chosen over methods which incorporate only amplitude information.
从成年人类头皮记录听觉稳态电位。刺激为以39.1次/秒的速率呈现的100微秒的滴答声。使用了四个刺激水平（-20、0、10和20 dB SL）。通过三种频域方法和检查人员确定是否存在反应。频域方法为：平方幅值相干（MSC）、相位相干（PC）和仅幅值（MO）。MSC方法通常具有最高的d'值，表明它是检测反应最敏感的方法。由MSC方法预测的听力阈值最低，并且在滴答声刺激的行为测量阈值的4 dB范围内。此外，反应的幅度比其相位的变化明显更大，并且未发现反应幅度的变异性与噪声幅度之间存在关系。总之，应选择纳入相位信息的反应检测方法（如MSC和PC），而不是仅纳入幅度信息的方法。
