Department of Future Technologies, University of Turku, Koskenniemenkatu 4, 20014, Finland; Phonetics and Learning, Age & Bilingualism laboratory (LAB-lab), University of Turku, Koskenniemenkatu 4, 20014, Finland.
Department of Signal Processing and Acoustics, Aalto University, P.O. Box 12200, 00076 Aalto, Finland.
Int J Psychophysiol. 2020 Jan;147:72-82. doi: 10.1016/j.ijpsycho.2019.11.005. Epub 2019 Nov 16.
The purpose of this study was to examine the efficacy of three days of listen-and-repeat training on the perception and production of vowel duration contrasts. Generalization to an untrained vowel and a non-linguistic sound was also examined. Twelve adults underwent four sessions of listen-and-repeat training over two days with the pseudoword contrast /tite/-/ti:te/. Generalization effects were examined with another vowel contrast, /tote/-/to:te/ and a sinusoidal tone pair as a non-linguistic stimulus. Learning effects were measured with psychophysiological (EEG) event-related potentials (mismatch negativity and N1), behavioral discrimination tasks and production tasks. The results showed clear improvement in all perception measurements for the trained stimuli. The effects also affected the untrained vowel by eliciting an N1 response, and affected the behavioral perception of the non-linguistic stimuli. The MMN response for the untrained linguistic stimuli, however, did not increase. These findings suggest that the training was able to increase the sensitivity of preattentive auditory duration discrimination, but that phoneme-specific spectral information may also be needed to shape the neural representation of phoneme categories.
本研究旨在考察三天的听-重复训练对元音时长对比感知和产生的效果。还考察了对未训练元音和非语言声音的泛化。12 名成年人在两天内进行了四次听-重复训练，使用的是伪词对比 /tite/-/ti:te/。使用另一个元音对比 /tote/-/to:te/和正弦音对作为非语言刺激来检查泛化效果。学习效果通过生理心理（EEG）事件相关电位（失匹配负波和 N1）、行为辨别任务和产生任务来测量。结果表明，所有训练刺激的感知测量都有明显改善。这些效果还通过引发 N1 反应影响了未训练元音，并影响了对非语言刺激的行为感知。然而，未训练语言刺激的 MMN 反应并没有增加。这些发现表明，训练能够提高非注意听觉时长辨别能力，但可能还需要音位特异性频谱信息来塑造音位类别的神经表示。
