Faucette Sarah P, Stuart Andrew
Department of Communication Sciences and Disorders, East Carolina University, Greenville, North Carolina 27858-4353, USA
J Acoust Soc Am. 2017 Aug;142(2):EL218. doi: 10.1121/1.4998151.
In this study, a release from masking (RFM) was sought with cortical auditory evoked potentials (CAEPs) elicited by speech (/da/) in competing continuous and interrupted noises. Two paradigms (i.e., fixed speech with varying signal-to-noise ratios and fixed noise with varying speech levels) were employed. Shorter latencies and larger amplitudes were observed in interrupted versus continuous noise at equivalent signal-to-noise ratios. With fixed speech presentation, P1-N1-P2 latencies were prolonged and peak N1 and P2 amplitudes decreased and more so with continuous noise. CAEP thresholds were lower in interrupted noise. This is the first demonstration of RFM with CAEPs to speech.
在本研究中，我们利用在竞争性连续噪声和间断噪声中由语音（/da/）诱发的皮层听觉诱发电位（CAEPs）来探寻掩蔽解除（RFM）。采用了两种范式（即固定语音且信噪比变化以及固定噪声且语音水平变化）。在等效信噪比下，与连续噪声相比，间断噪声中观察到潜伏期更短且波幅更大。在固定语音呈现时，P1 - N1 - P2潜伏期延长，N1和P2峰值波幅降低，在连续噪声中更为明显。间断噪声中的CAEP阈值更低。这是首次用CAEPs证明对语音存在掩蔽解除。
