Magnetoencephalographic evidence for a precise 4b forward model in speech production
Magnetoencephalographic evidence for a precise 4b forward model in speech production
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DOI：
10.1097/01.wnr.0000233102.43526.e9
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发表时间：
2006-09-18
期刊：
影响因子：
1.7
通讯作者：
Houde, John F.
中科院分区：
文献类型：
--
作者：
Heinks-Maldonado, Theda H.;Nagarajan, Srikantan S.;Houde, John F.
脑电图学和脑磁图学研究表明，与对录音语言的反应相比，听觉皮质对自我产生的语言的反应会减弱，但如果听觉反馈发生变化，这种衰减就会消失。这些结果表明，说话过程中的听觉反馈是通过将反馈与其内部预测进行比较来处理的。本研究使用脑磁图来研究这一匹配过程的精确度。在改变的反馈条件下记录对语音反馈的听觉反应。在语音产生过程中，相对于音调变化的语音反馈和外来语音反馈，M100的幅度被最大限度地降低到参与者自己的未改变的声音反馈。这表明反馈比较过程可能非常精确，使听觉系统能够区分听觉信息的内部和外部来源。
Electroencephalography and magnetoencephalography studies have shown that auditory cortical responses to self-produced speech are attenuated when compared with responses to tape-recorded speech, but that this attenuation disappears if auditory feedback is altered. These results suggest that auditory feedback during speaking is processed by comparing the feedback with its internal prediction. The present study used magnetoencephalography to investigate the precision of this matching process. Auditory responses to speech feedback were recorded under altered feedback conditions. During speech production, the M100 amplitude was maximally reduced to the participants' own unaltered voice feedback, relative to pitch-shifted and alien speech feedback. This suggests that the feedback comparison process may be very precise, allowing the auditory system to distinguish between internal and external sources of auditory information.