The representation of noise vocoded speech in the auditory nerve of the chinchilla: Physiological correlates of the perception of spectrally reduced speech
The representation of noise vocoded speech in the auditory nerve of the chinchilla: Physiological correlates of the perception of spectrally reduced speech
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DOI：
10.1016/j.heares.2006.01.011
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发表时间：
2006-03-01
期刊：
影响因子：
2.8
通讯作者：
Wickesberg, RE
中科院分区：
文献类型：
--
作者：
Loebach, JL;Wickesberg, RE
本研究研究了自然产生的语音信号和噪声声码语音信号在栗鼠听神经中的神经表征。由男性说话者产生的音节/b(SIC)/、/d(SIC)/、/tu/和/p(SIC)/被用来合成包含一、二、三和四个带包络调制噪声的噪声声码语音刺激。通过汇集许多听神经纤维上的PST直方图来计算听神经的整体反应，揭示了对唯一识别停止辅音的自然标志的反应的时间模式。对3和4频段噪声声码令牌的反应包含的时间模式与观察到的自然令牌几乎相同，而对1和2频段令牌的反应显著不同(p<；0.0001)。共用的PST直方图的ALSR、ALiR和自相关代表了自然产生的元音的频谱细节，而驱动率是不可靠的。这些频谱分析中的每一个都未能揭示关于噪音声码元音的重要信息。这些结果表明，听神经反应的时间模式可以为识别噪声声码停止辅音提供必要的线索。(C)2006爱思唯尔B.V.保留所有权利。
This Study investigated the neural representation of naturally produced and noise vocoded speech signals in the auditory nerve of the chinchilla. The syllables /b(sic)/, /d(sic)/, /tu / and /p(sic)/ produced by male speakers were used to synthesize noise vocoded speech stimuli containing one, two, three and four bands of envelope modulated noise. The ensemble response of the auditory nerve, computed by pooling the PST histograms across many auditory nerve fibers, revealed temporal patterns in the responses to the natural tokens that uniquely identified the stop consonants. The responses to the 3- and 4-band noise vocoded tokens contained temporal patterns that were nearly identical to those observed for the natural tokens, while the responses to the 1- and 2-band tokens were significantly different (p < 0.0001). The ALSR, ALIR and autocorrelation of the pooled PST histograms represented the detail of the frequency spectrum for a naturally produced vowel, while the driven rate was unreliable. Each of these spectral analyses failed to reveal significant information about the noise vocoded vowels. These results Suggest that temporal patterns in the responses of the auditory nerve can provide the cues necessary for the recognition of noise vocoded stop consonants. (C) 2006 Elsevier B.V. All rights reserved.