Probing category selectivity for environmental sounds in the human auditory brain
Probing category selectivity for environmental sounds in the human auditory brain
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DOI：
10.1016/j.neuropsychologia.2008.05.011
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发表时间：
2008-09-01
期刊：
影响因子：
2.6
通讯作者：
Altmann, Christian F.
中科院分区：
文献类型：
--
作者：
Doehrmann, Oliver;Naumer, Marcus J.;Altmann, Christian F.
早期的研究报告表明，在颞叶的上级和中间颞区，对环境声音（如动物发声和工具声）存在不同的类别相关听觉表征。本研究结合功能性磁共振成像（fMRI）适应技术和无声获取方法，进一步探讨环境声音的类别相关听觉加工。为此，我们连续呈现了从类别“工具声音”或“动物发声”中提取的具有相同或不同身份/类别的声音对。我们研究了选择性的程度，这一程度可以通过全脑以及功能和解剖学限制的感兴趣区域分析过程中对两种或仅一种声音类别的适应效应来证明。虽然颞叶皮层中的大多数区域主要表现出对两种声音类别的适应，特别是左上级颞回（STG）和左后中颞回（pMTG）分别选择性地适应动物发声和工具声。然而，这些地区的激活配置文件不同的一般反应的声音。虽然工具的声音仍然产生fMRI信号显着不同的固定基线的STG，这是不是动物发声pMTG.Consistent解释STG作为一个中间的听觉处理阶段的情况下，这个区域可能会区分听觉刺激的物理刺激特性的变化为基础的类别。然而，左pMTG的处理似乎更局限于人造物体的动作相关声音。(C)2008爱思唯尔有限公司保留所有权利。
Earlier studies reported evidence suggesting distinct category-related auditory representations for environmental sounds such as animal vocalizations and tool sounds in superior and middle temporal regions of the temporal lobe. However, the degree of selectivity of these representations remains to be determined.The present study combined functional magnetic resonance imaging (fMRI) adaptation with a silent acquisition protocol to further investigate category-re la red auditory processing of environmental sounds. To this end, we consecutively presented pairs of sounds taken from the categories 'tool sounds' or 'animal vocalizations' with either the same or different identity/category. We examined the degree of selectivity as evidenced by adaptation effects to both or only one sound category in the course of whole-brain as well as functionally and anatomically constrained region of interest analyses.While most regions predominately in the temporal cortex showed an adaptation to both sound categories, particularly the left superior temporal gyrus (STG) and the left posterior middle temporal gyrus (pMTG) selectively adapted to animal vocalizations and tool sounds, respectively. However, the activation profiles of these regions differed with respect to the general responsiveness to sounds. While tool sounds still produced fMRI signals significantly different from fixation baseline in the STG, this was not the case for animal vocalizations in pMTG.Consistent with the interpretation of STG as an intermediate auditory processing stage, this region might differentiate auditory stimuli into categories based on variations of physical stimulus properties. However, processing in left pMTG seems to be even more restricted to action-related sounds of man-made objects. (C) 2008 Elsevier Ltd. All rights reserved.