Heinks-Maldonado Theda H, Nagarajan Srikantan S, Houde John F
Department of Otolaryngology, University of California, San Francisco, California 94143, USA.
Neuroreport. 2006 Sep 18;17(13):1375-9. doi: 10.1097/01.wnr.0000233102.43526.e9.
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.
脑电图和脑磁图研究表明，与对录音语音的反应相比，听觉皮层对自我产生的语音的反应会减弱，但如果改变听觉反馈，这种减弱就会消失。这些结果表明，说话时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种匹配过程的精确性。在改变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，相对于音高变化和外来语音反馈，M100振幅最大程度地降低到参与者自己未改变的语音反馈。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。
