听觉条件下蒙古语元音和谐的偏侧化分析

An ERP Research on Mongolian Vowel Harmony Based on the Auditory Condition

文章研究记录了被试在无意识状态下(给被试播放无声无字幕电影,并要求被试忽略所听到的声音)感知蒙古语元音和谐的脑电数据,以探讨听觉条件下大脑对蒙古语元音和谐的ERP反映情况.对比不同变化条件下的脑电数据(蒙古语元音:和谐与不和谐;紧元音:和谐与不和谐;松元音:和谐与不和谐),以进行偏侧化实验.分析结果显示:1在听觉条件下,以Oddball范式呈现不和谐元音作为偏差刺激,和谐元音作为标准刺激.不管是紧元音、松元音还是蒙古语元音,均未诱发明显的MMN和P300.2被试感知刺激时所激活的脑区集中在额叶、中央区和颞叶.但感知强度有所不同,大脑对紧元音的感知强度相比松元音和蒙古语元音的要弱,而松元音和蒙古语元音的感知强度较为相近.

This study aimed to investigate ERP data of Mongolian vowel harmony based on the auditory condition which recorded on the participants who looked at the silent film and ignored the sound from the headphones. By comparing the EEG data under different conditions （Mongolian vowel, lax vowels, tense vowel） and analyzing the cerebral partial lateralization and traceability, the following results could be obtained that P300 and MMN were not obviously induced in orther the lax vowels, or tense vowel or Mongolian vowel in this auditory experiment; the brain activation was concentrated in the frontal, central and temporal lobes when the participants perceived stimulus. But there were significant differences in the perception intensity of the brain. The perception intensity of tense vowels was weaker than that of the lax vowels and Mongolian vowels. Additionally, the perception intensity of loose vowels and Mongolian vowel was more similar.