Kojima H, Hirano S, Shoji K, Naito Y, Honjo I, Kamoto Y, Okazawa H, Ishizu K, Yonekura Y, Nagahama Y, Fukuyama H, Konishi J
Department of Hearing and Speech Science, Graduate School of Medicine, Kyoto University, Japan.
Neuroreport. 1997 Jul 7;8(9-10):2395-8. doi: 10.1097/00001756-199707070-00058.
To elucidate the temporal coding system for speech recognition, we synthesized stimulation sounds which do not contain formant information but do contain temporal information by transforming original sound wave to click sequences. Using this stimulation sound, we performed a recognition test and used PET to examine the cortical activities in normal subjects listening to this sound. The results of the recognition test showed a good perception of the sounds made from sequential speech. The PET study demonstrated significant activation of the superior temporal gyri while listening to the stimulation speech sounds. Our results imply that these stimulation sounds were processed semantically in the auditory cortices. The temporal processing system is thought to make an important contribution to speech recognition.
为了阐明语音识别的时间编码系统，我们通过将原始声波转换为滴答序列，合成了不含共振峰信息但包含时间信息的刺激声音。使用这种刺激声音，我们进行了一项识别测试，并利用正电子发射断层扫描（PET）来检查正常受试者在听这种声音时的皮层活动。识别测试结果表明，对连续语音发出的声音有良好的感知。PET研究显示，在听刺激语音声音时，颞上回有显著激活。我们的结果表明，这些刺激声音在听觉皮层中进行了语义处理。时间处理系统被认为对语音识别做出了重要贡献。
