Auditory evoked fields elicited by spectral, temporal, and spectral-temporal changes in human cerebral cortex.

Auditory evoked fields elicited by spectral, temporal, and spectral-temporal changes in human cerebral cortex.
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DOI:
10.3389/fpsyg.2012.00149
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发表时间:
2012
影响因子:
3.8
通讯作者:
Pantev C
Pantev C
中科院分区:
心理学3区
文献类型:
--
作者:
Okamoto H;Teismann H;Kakigi R;Pantev C

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自然声音包含复杂的频谱成分,这些成分被暂时调制为时变信号。最近的研究表明,听觉系统对频谱和时间声音信息的编码不同。然而,人类大脑如何处理包含频谱和时间变化的声音仍未得到解决。在本研究中,我们利用脑磁图研究了频谱、时间和频谱-时间声音变化引起的人类听觉诱发反应。谱-时间变化引起的听觉诱发反应与谱-时间变化引起的听觉诱发反应非常相似,但谱-时间变化引起的听觉诱发反应延迟30 ~ 50 ms,在形态上与其他诱发反应不同。结果表明,即使频谱和时间变化同时发生,人类大脑对频谱声音变化的反应也先于时间声音变化的反应。
Natural sounds contain complex spectral components, which are temporally modulated as time-varying signals. Recent studies have suggested that the auditory system encodes spectral and temporal sound information differently. However, it remains unresolved how the human brain processes sounds containing both spectral and temporal changes. In the present study, we investigated human auditory evoked responses elicited by spectral, temporal, and spectral–temporal sound changes by means of magnetoencephalography. The auditory evoked responses elicited by the spectral–temporal change were very similar to those elicited by the spectral change, but those elicited by the temporal change were delayed by 30–50 ms and differed from the others in morphology. The results suggest that human brain responses corresponding to spectral sound changes precede those corresponding to temporal sound changes, even when the spectral and temporal changes occur simultaneously.
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