Purdy S C, Houghton J M, Keith W J, Greville K A
National Audiology Centre, Auckland, New Zealand.
Audiology. 1989;28(2):82-91. doi: 10.3109/00206098909081613.
Ipsilateral masking levels and normal thresholds for tone pip auditory brainstem responses (ABRs) were investigated in normal subjects for the purpose of establishing recording parameters and norms for frequency-specific tone pip ABR testing. White noise was found to effectively mask ABRs to tone pips at mean signal-to-noise ratios of between -1 and -5.5 dB [dB peak-equivalent (pe) SPL/dB SPL] depending on the tone pip frequency. ABR thresholds were established for tone pips in the presence of ipsilateral masking with high-pass filtered noise for 50-Hz tone pips and notched noise for tone pips from 1,000 to 4,000 Hz, at a nominal signal-to-noise ratio of -5 dB (i.e. with the noise SPL measured prior to filtering). Thresholds occurred between 28.6 and 36.6 dB pe SPL, equivalent to 4.4-8.8 dB nHL. ABR thresholds for masked and unmasked tone pips did not differ significantly.
为了建立特定频率短纯音听觉脑干反应（ABR）测试的记录参数和标准，对正常受试者的同侧掩蔽水平和短纯音ABR的正常阈值进行了研究。发现白噪声在平均信噪比为-1至-5.5 dB[dB峰值等效（pe）声压级/ dB声压级]时可有效掩蔽短纯音的ABR，具体取决于短纯音的频率。对于50 Hz短纯音，使用高通滤波噪声进行同侧掩蔽；对于1000至4000 Hz的短纯音，使用带陷波噪声进行同侧掩蔽，在标称信噪比为-5 dB（即滤波前测量的噪声声压级）的情况下，建立了短纯音的ABR阈值。阈值出现在28.6至36.6 dB pe SPL之间，相当于4.4 - 8.8 dB nHL。掩蔽和未掩蔽短纯音的ABR阈值没有显著差异。
