Modulation of Auditory Evoked Magnetic Fields Elicited by Successive Frequency-Modulated (FM) Sweeps.
Modulation of Auditory Evoked Magnetic Fields Elicited by Successive Frequency-Modulated (FM) Sweeps.
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DOI：
10.3389/fnhum.2017.00036
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发表时间：
2017
影响因子：
2.9
通讯作者：
Kakigi R
中科院分区：
文献类型：
--
作者：
Okamoto H;Kakigi R
在我们的日常生活中，我们不断地接触到调频（FM）声音，在语音和物种特定的通信中发挥着重要作用。先前的研究表明，重复暴露于相同的纯音会导致神经活动减少。然而，FM声音重复出现对人类听觉皮层神经活动的影响仍然不清楚。在本研究中，我们使用脑磁图来研究听觉诱发的N1 m反应引起的四个连续的时间重复和叠加FM扫描在三个序列：（1）四个FM扫描是相同的，（2）四个FM扫描具有相同的FM方向和频率，但不同的载波频率，（3）四个FM扫描的FM频率和/或方向及其载波频率不同。与我们的预期相反，获得的结果表明，N1 m响应是最大的四个FM扫描时是相同的，当它们是不同的最小。这些结果表明，在人类听觉皮层的重复调频扫描的神经处理可能不同于重复纯音。
In our daily life, we are successively exposed to frequency-modulated (FM) sounds that play an important role in speech and species-specific communication. Previous studies demonstrated that repetitive exposure to identical pure tones resulted in decreased neural activity. However, the effects of repetitively presented FM sounds on neural activity in the human auditory cortex remain unclear. In the present study, we used magnetoencephalography to investigate auditory evoked N1m responses elicited by four successive temporally repeated and superimposed FM sweeps in three sequences: (1) four FM sweeps were identical, (2) four FM sweeps had the same FM direction and rate, but different carrier frequencies, (3) four FM sweeps differed with respect to the FM rate and/or direction and their carrier frequencies. In contrast to our expectations, the results obtained demonstrated that N1m responses were maximal when the four FM sweeps were identical and minimal when they were distinct. These results suggest that the neural processing of repetitive FM sweeps in the human auditory cortex may differ from that of repetitive pure tones.