Mizuochi Tomomi, Yumoto Masato, Karino Shotaro, Itoh Kenji, Yamasoba Tatsuya
Department of aSensory and Motor Neuroscience, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
Neuroreport. 2007 Dec 3;18(18):1945-9. doi: 10.1097/WNR.0b013e3282f202c6.
To investigate the temporal aspect of timbre processing, we recorded auditory-evoked neuromagnetic responses to periodic complex sounds, which were matched in all acoustic parameters except for two fundamental frequencies (F0s) and 12 spectral envelopes of vocal and nonvocal categories. Only for nonvocal sounds, a significant difference in N1m latency for F0 was detected in both hemispheres. A significant difference among stimuli was detected in both hemispheres for vocal and linear sounds, whereas only in the right hemisphere for instrumental sounds. Moreover, the results of paired comparison among F0s revealed that not only the vocal sounds but also some of the nonvocal sounds were F0-independent. This latency independence may be attributed to the relatively high power in the higher frequency spectrum.
为了研究音色处理的时间特性，我们记录了对周期性复合声音的听觉诱发神经磁反应，这些声音在所有声学参数上均相匹配，但有两个基频（F0）以及12种声乐和非声乐类别的频谱包络除外。仅对于非声乐声音，在两个半球均检测到F0的N1m潜伏期存在显著差异。对于声乐和线性声音，在两个半球均检测到刺激之间存在显著差异，而对于器乐声音，仅在右半球检测到显著差异。此外，F0之间的配对比较结果表明，不仅声乐声音，而且一些非声乐声音也与F0无关。这种潜伏期独立性可能归因于高频频谱中相对较高的功率。
