Processing of spectral and amplitude envelope of animal vocalizations in the human auditory cortex
Processing of spectral and amplitude envelope of animal vocalizations in the human auditory cortex
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DOI：
10.1016/j.neuropsychologia.2010.05.024
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发表时间：
2010-08-01
期刊：
影响因子：
2.6
通讯作者：
Kaiser, Jochen
中科院分区：
文献类型：
--
作者：
Altmann, Christian F.;de Oliveira, Cicero Gomes, Jr.;Kaiser, Jochen
在日常生活中，我们通常可以轻松有效地识别声音。两个属性是特别突出的和重要的声音识别：声音的整体频谱包络和其时间振幅包络。在这项研究中，我们的目的是调查这两个功能在人类听觉皮层的表征，通过使用功能磁共振成像适应范式。我们提出了来自动物发声的声音刺激对，保留了动物发声的时间平均频谱和幅度包络。我们提出了四种不同情况下的对：（a）具有相同幅度包络和平均谱包络的对，（B）相同幅度包络，但不同的平均谱包络，（c）不同幅度包络，但相同的平均谱包络和（d）不同的幅度包络和平均谱包络。我们发现的平均频谱包络和振幅包络的动物发声重叠的皮质区在双侧上级颞回后Heschl的回的fMRI适应效果。对振幅包络敏感的区域沿着左半球的上级颞上回进一步向前延伸，而对频谱包络敏感的区域沿着右侧上级颞上回进一步向前延伸。左侧上级颞叶内的后色调区域显示对平均频谱的敏感性。我们的研究结果表明，参与的主要听觉领域的频谱线索的代表性和编码的一般频谱-时间特性的自然声音在非主要的后部和外侧上级颞叶皮层。(C)2010爱思唯尔有限公司保留所有权利。
In daily life, we usually identify sounds effortlessly and efficiently. Two properties are particularly salient and of importance for sound identification: the sound's overall spectral envelope and its temporal amplitude envelope. In this study, we aimed at investigating the representation of these two features in the human auditory cortex by using a functional magnetic resonance imaging adaptation paradigm. We presented pairs of sound stimuli derived from animal vocalizations that preserved the time-averaged frequency spectrum of the animal vocalizations and the amplitude envelope. We presented the pairs in four different conditions: (a) pairs with the same amplitude envelope and mean spectral envelope, (b) same amplitude envelope, but different mean spectral envelope, (c) different amplitude envelope, but same mean spectral envelope and (d) both different amplitude envelope and mean spectral envelope. We found fMRI adaptation effects for both the mean spectral envelope and the amplitude envelope of animal vocalizations in overlapping cortical areas in the bilateral superior temporal gyrus posterior to Heschl's gyrus. Areas sensitive to the amplitude envelope extended further anteriorly along the lateral superior temporal gyrus in the left hemisphere, while areas sensitive to the spectral envelope extended further anteriorly along the right lateral superior temporal gyrus. Posterior tonotopic areas within the left superior temporal lobe displayed sensitivity for the mean spectrum. Our findings suggest involvement of primary auditory areas in the representation of spectral cues and encoding of general spectro-temporal features of natural sounds in non-primary posterior and lateral superior temporal cortex. (C) 2010 Elsevier Ltd. All rights reserved.