Hemispheric specialization for processing auditory nonspeech stimuli
Hemispheric specialization for processing auditory nonspeech stimuli
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DOI：
10.1093/cercor/bhj068
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发表时间：
2006-09-01
期刊：
影响因子：
3.7
通讯作者：
Matthews, Paul M.
中科院分区：
文献类型：
--
作者：
Jamison, Helen L.;Watkins, Kate E.;Matthews, Paul M.
左半球对言语感知的专门化可能源于更基本的听觉处理水平上的不对称。特别是，它已被建议，在“时间”和“光谱”处理存在于两个半球之间。在这里，我们使用功能性磁共振成像来进一步验证这一假设。14名健康的志愿者听了一系列在时间和频谱域上变化的交替纯音。增加的时间变化与双侧Heschl回（HG）的激活相关，而增加的频谱变化激活双侧上级颞回（STG）和右后上级颞沟（STS）。对增加的时间变化的反应偏侧到左半球，这左侧偏侧是更大的后内侧HG，这是假定对应于初级听觉皮层。对光谱变化增加的反应偏向右半球，特别是在前STG和后STS。这些发现与以下观点相一致：即使在没有语言信息的情况下，大脑半球也有不同的听觉刺激处理能力。
The left hemisphere specialization for speech perception might arise from asymmetries at more basic levels of auditory processing. In particular, it has been suggested that differences in "temporal" and "spectral" processing exist between the hemispheres. Here we used functional magnetic resonance imaging to test this hypothesis further. Fourteen healthy volunteers listened to sequences of alternating pure tones that varied in the temporal and spectral domains. Increased temporal variation was associated with activation in Heschl's gyrus (HG) bilaterally, whereas increased spectral variation activated the superior temporal gyrus (STG) bilaterally and right posterior superior temporal sulcus (STS). Responses to increased temporal variation were lateralized to the left hemisphere; this left lateralization was greater in posteromedial HG, which is presumed to correspond to the primary auditory cortex. Responses to increased spectral variation were lateralized to the right hemisphere specifically in the anterior STG and posterior STS. These findings are consistent with the notion that the hemispheres are differentially specialized for processing auditory stimuli even in the absence of linguistic information.