Sustained magnetic fields reveal separate sites for sound level and temporal regularity in human auditory cortex
Sustained magnetic fields reveal separate sites for sound level and temporal regularity in human auditory cortex
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DOI：
10.1006/nimg.2001.0949
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发表时间：
2002-01-01
期刊：
影响因子：
5.7
通讯作者：
Scherg, M
中科院分区：
文献类型：
--
作者：
Gutschalk, A;Patterson, RD;Scherg, M
本文应用脑磁图技术研究了听觉皮层持续磁场与周期性声音知觉的关系。在三种声音强度下测量对规则和不规则咔哒声的反应。两个独立的源被隔离邻近初级听觉皮层：一个，位于外侧Heschl的回，是特别敏感的规律性和很大程度上不敏感的声音水平。第二个位于颞平面的第一个的后面，对声音水平特别敏感，对规律性很大程度上不敏感。这种对相同刺激的双重分离表明，这两个来源代表不同的机制;第一个似乎与音高感知有关，第二个与响度有关。发现持续场的偏移的延迟随着互击间隔至少增加到204 ms，这表明持续场偏移代表复杂的偏移监测机制，而不是简单地停止刺激。(C)2002年，Elsevier Science。
Magnetoencephalography was used to investigate the relationship between the sustained magnetic field in auditory cortex and the perception of periodic sounds. The response to regular and irregular click trains was measured at three sound intensities. Two separate sources were isolated adjacent to primary auditory cortex: One, located in lateral Heschl's gyrus, was particularly sensitive to regularity and largely insensitive to sound level. The second, located just posterior to the first in planum temporale, was particularly sensitive to sound level and largely insensitive to regularity. This double dissociation to the same stimuli indicates that the two sources represent separate mechanisms; the first would appear to be involved with pitch perception and the second with loudness. The delay of the offset of the sustained field was found to increase with interclick interval up to 204 ms at least, which suggests that the sustained field offset represents a sophisticated offset-monitoring mechanism rather than simply the cessation of stimulation. (C) 2002 Elsevier Science.