The effect of age on release from masking (RFM) was examined using cortical auditory evoked potentials (CAEPs). Two speech-in-noise paradigms [i.e., fixed speech with varying signal-to-noise ratios (SNRs) and fixed noise with varying speech levels], similar to those used in behavioral measures of RFM, were employed with competing continuous and interrupted noises. Young and older normal-hearing adults participated (N = 36). Cortical responses were evoked in the fixed speech paradigm at SNRs of −10, 0, and 10 dB. In the fixed noise paradigm, the CAEP SNR threshold was determined in both noises as the lowest SNR that yielded a measurable response. RFM was demonstrated in the fixed speech paradigm with a significant amount of missing responses, longer P1 and N1 latencies, and smaller N1 response amplitudes in continuous noise at the poorest −10 dB SNR. In the fixed noise paradigm, RFM was demonstrated with significantly lower CAEP SNR thresholds in interrupted noise. Older participants demonstrated significantly longer P2 latencies and reduced P1 and N1 amplitudes. There was no evidence of a group difference in RFM in either paradigm.

中文翻译：

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年轻人和老年人的掩蔽电生理释放检查

使用皮质听觉诱发电位（CAEPs）检查了年龄对掩蔽释放（RFM）的影响。与RFM行为测量中所使用的相似，采用了两种有噪声的范例[即，具有变化的信噪比（SNR）的固定语音和具有变化的语音水平的固定噪声]，用于竞争性连续和中断噪声。听力正常的年轻人和老年人（N = 36）。在固定语音范例中，以-10、0和10 dB的SNR诱发皮质反应。在固定噪声范式中，将两种噪声中的CAEP SNR阈值确定为产生可测量响应的最低SNR。RFM在固定语音范式中得到了证明，它在相当低的-10 dB SNR的连续噪声中具有大量的遗漏响应，较长的P1和N​​1延迟以及较小的N1响应幅度。在固定噪声范例中，RFM在中断噪声中的CAEP SNR阈值明显较低。年龄较大的参与者表现出明显更长的P2潜伏期和减小的P1和N​​1振幅。在这两种范式中，没有证据表明RFM存在群体差异。