Human Cortical Dynamics Determined by Speech Fundamental Frequency
Human Cortical Dynamics Determined by Speech Fundamental Frequency
复制标题
由语音基频决定的人类皮质动力学
作者：
A. Mäkelä;P. Alku;V. Mäkinen;Jussi Valtonen;P. May;H. Tiitinen
语音特定的大脑过程的证据已经通过操纵共振峰频率来寻找，共振峰频率介导语音内容，从进化的角度来看，是语音的相对“新”方面。在这里，我们使用全头脑磁图和先进的刺激再现方法来研究的贡献的基本频率F0和它的谐波整数倍在皮层处理。受试者被呈现一个元音，一个频率匹配的对应元音缺乏语音内容，和一个纯音。刺激的F0设定为典型男性的F0（即，100 Hz）、女性（200 Hz）或婴儿（270 Hz）扬声器。我们发现，语音声音，无论有没有语音内容，在120 ms的恒定潜伏期在人类听觉皮层引起N1m反应，而频率，强度和持续时间与语音声音匹配的纯音引起N1m反应，其潜伏期在120和160 ms之间变化。似乎基频F0及其谐波决定了人类听觉皮层中语音处理的时间动态，并且语音特异性来自于皮层对由人类声音决定的复杂声学结构的敏感性生产设备。
Evidence for speech-specific brain processes has been searched for through the manipulation of formant frequencies which mediate phonetic content and which are, in evolutionary terms, relatively "new" aspects of speech. Here we used whole-head magnetoencephalography and advanced stimulus reproduction methodology to examine the contribution of the fundamental frequency F0 and its harmonic integer multiples in cortical processing. The subjects were presented with a vowel, a frequency-matched counterpart of the vowel lacking in phonetic contents, and a pure tone. The F0 of the stimuli was set at that of a typical male (i.e., 100 Hz), female (200 Hz), or infant (270 Hz) speaker. We found that speech sounds, both with and without phonetic content, elicited the N1m response in human auditory cortex at a constant latency of 120 ms, whereas pure tones matching the speech sounds in frequency, intensity, and duration gave rise to N1m responses whose latency varied between 120 and 160 ms. Thus, it seems that the fundamental frequency F0 and its harmonics determine the temporal dynamics of speech processing in human auditory cortex and that speech specificity arises out of cortical sensitivity to the complex acoustic structure determined by the human sound production apparatus.
影响因子：
56.9
作者：
KUHL, PK;WILLIAMS, KA;LINDBLOM, B
通讯作者：
LINDBLOM, B