Auditory M50 and M100 responses to broadband noise: functional implications
Auditory M50 and M100 responses to broadband noise: functional implications
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DOI：
10.1097/00001756-200411150-00004
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发表时间：
2004-11-15
期刊：
影响因子：
1.7
通讯作者：
Poeppel, D
中科院分区：
文献类型：
--
作者：
Chait, M;Simon, JZ;Poeppel, D
M50和M100听觉诱发场的功能意义尚不清楚。在这里，我们报告的听觉诱发场数据从三个不同的研究采用宽带噪声刺激。我们发现，对于相同的刺激，M100的强度，以及它的偏侧化，任务调制。相比之下，M50显示出三个特性：它对噪声刺激比纯音更明显，似乎不依赖于任务，并且在所有任务条件下左半球都显着更强。这些对比的激活模式揭示了反应产生机制的性质，并建议在听觉图形-背景分离过程中的作用。
The functional significance of the M50 and M100 auditory evoked fields remains unclear. Here we report auditory evoked field data from three different studies employing wide-band noise stimuli. We find that, for the same stimuli, the strength of the M100, as well as its lateralization, are task-modulated. The M50, in contrast, shows three properties: It is dramatically more pronounced for noise stimuli than for pure tones, does not seem to be task dependent, and, is significantly stronger in the left hemisphere in all task conditions. These contrasting patterns of activation shed light on the properties of the response-generating mechanisms and suggest roles in the process of auditory figure-ground segregation.