Neural mismatch response resulting from the difference between prediction and observation is related to change detection and discrimination. Robust neuromagnetic brain activity of auditory mismatch-related perception occurs in response to non-prototypical vowels in across-category contrasts for first-language speakers. However, whether this non-prototypicality effect applies to within-category vowel perception remains to be elucidated. Here, healthy Japanese adults (n = 7) were subjected to magnetoencephalography (MEG) while watching a silent movie, and passively listened to synthesized English vowels /i/. We observed the source-level mismatch effect to the mid-high near-front vowel deviant [ɪ] with the most non-prototypical, unspecified feature in the participants’ native language system. The mismatch effect recruited the left posterior superior temporal sulcus with a peak latency of 225 ms post-stimulus onset. We further studied whether a longer F1 distance between vowel pairs would increase mismatch-activated intensities, however, we did not observe neuromagnetic changes when the prototypical anchor standard [i] was compared with three non-prototypical deviants differing in first resonance frequency (F1) values. Our results indicate that an F1 increase in within-category upper front vowel perception is a strong activator of mismatch responses measured by source-level activated intensities for non-native listeners.

由预测和观察之间的差异引起的神经失配反应与变化检测和判别有关。听觉失配相关知觉的强大的神经磁脑活动发生在针对第一语言说话者的跨类别对比中，响应于非典型元音。但是，这种非原型的效果是否适用于类别内元音感知仍有待阐明。在这里，健康的日本成年人（n  = 7）在观看无声电影的同时进行了脑磁图检查（MEG），并被动收听了合成的英语元音/ i /。我们观察到的源代码级的不匹配效果到[中高接近前元音离经叛道ɪ]在参与者的母语系统中具有最典型的，未指定的功能。这种失配效应招募了左后颞上沟，刺激后发作的潜伏期为225 ms。我们进一步研究了元音对之间更长的F1距离是否会增加失配激活的强度，但是，当将原型锚定标准[ i ]与三个在第一共振频率（F1）不同的非原型偏差进行比较时，我们没有观察到神经磁学变化。价值观。我们的结果表明，类别F1中上前元音感知能力的增强是非匹配听众通过源级别激活强度测量的失配响应的强大激活因子。