基于耳蜗行波理论的线性调频信号刺激听觉稳态反应研究

Auditory steady-state response analysis with chirp signal stimuli based on cochlear traveling wave delay

周期性短声(click)诱发的听觉稳态反应(ASSR)可用于临床测听与脑状态检测。该文研究一种基于耳蜗基底膜行波理论设计的线性调频声(chirp)诱发ASSR的方法。该方法以周期性的chirp声刺激人耳获得ASSR,比较了40Hz和90Hz下的chirp音与click音所获得ASSR在头皮分布、幅度的差异,并计算基于改进Rayleigh检测的ASSR检出率。结果表明:相同声压级下,chirp声比click能够诱发出更稳定、更高信噪比的ASSR,缩短检出时间,可替换click音在临床上应用。

Auditory steady-state response （ASSR） evoked by periodical click can be used in the field of clinical hearing tests and brain state detection. This paper studies a method that evokes ASSR by chirp stimuli based on cochlear basilar membrane traveling wave delay, with ASSR measured with stable frequency stimulation using chirp or click sound. The difference of the signal distribution and amplitude between ASSRs by chirp and click of 40 Hz and 90 Hz was identified with the detection rate of ASSR calculated using modified Rayleigh test method. The results show that the ASSR evoked by chirp is more stable with higher SNR and faster detection than the ASSR evoked by click. Therefore, this approach is promising in clinical application instead of the click method.