使用直接音频输入的辅助电生理学：放大和绝对信号水平的影响
Aided Electrophysiology Using Direct Audio Input: Effects of Amplification and Absolute Signal Level.
作者信息
Chun Ingyu, Billings Curtis J, Miller Christi W, Tremblay Kelly L
出版信息
Am J Audiol. 2016 Mar;25(1):14-24. doi: 10.1044/2015_AJA-15-0029.
PURPOSE
This study investigated (a) the effect of amplification on cortical auditory evoked potentials (CAEPs) at different signal levels when signal-to-noise ratios (SNRs) were equated between unaided and aided conditions, and (b) the effect of absolute signal level on aided CAEPs when SNR was held constant.
METHOD
CAEPs were recorded from 13 young adults with normal hearing. A 1000-Hz pure tone was presented in unaided and aided conditions with a linear analog hearing aid. Direct audio input was used, allowing recorded hearing aid noise floor to be added to unaided conditions to equate SNRs between conditions. An additional stimulus was created through scaling the noise floor to study the effect of signal level.
RESULTS
Amplification resulted in delayed N1 and P2 peak latencies relative to the unaided condition. An effect of absolute signal level (when SNR was constant) was present for aided CAEP area measures, such that larger area measures were found at higher levels.
CONCLUSION
Results of this study further demonstrate that factors in addition to SNR must also be considered before CAEPs can be used to clinically to measure aided thresholds.
目的
本研究调查了（a）当在未助听和助听条件下信噪比（SNR）相等时，放大对不同信号水平下皮质听觉诱发电位（CAEP）的影响，以及（b）当SNR保持恒定时，绝对信号水平对助听CAEP的影响。
方法
从13名听力正常的年轻成年人中记录CAEP。使用线性模拟助听器在未助听和助听条件下呈现1000赫兹纯音。采用直接音频输入，将记录的助听器本底噪声添加到未助听条件下，以使各条件下的SNR相等。通过对本底噪声进行缩放来创建额外的刺激，以研究信号水平的影响。
结果
与未助听条件相比，放大导致N1和P2峰潜伏期延迟。对于助听CAEP面积测量，存在绝对信号水平的影响（当SNR恒定时），即在较高水平下发现较大的面积测量值。
结论
本研究结果进一步表明，在将CAEP用于临床测量助听阈值之前，除了SNR之外，还必须考虑其他因素。
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