ISSN 0439-755X
CN 11-1911/B
主办:中国心理学会
   中国科学院心理研究所
出版:科学出版社

心理学报 ›› 2020, Vol. 52 ›› Issue (6): 730-741.doi: 10.3724/SP.J.1041.2020.00730

• 研究报告 • 上一篇    下一篇

2~4岁普通话儿童前注意阶段的声调感知机制

杨婉晴, 肖容, 梁丹丹()   

  1. 南京师范大学文学院, 南京 210097
  • 收稿日期:2019-04-04 出版日期:2020-06-25 发布日期:2020-04-22
  • 通讯作者: 梁丹丹 E-mail:ldd233@163.com
  • 基金资助:
    * 江苏高校优势学科建设工程资助项目(简称PAPD)

Lexical tone perception mechanism in 2- to 4-year-old Mandarin-speaking children in the pre-attention stage

YANG Wanqing, XIAO Rong, LIANG Dandan()   

  1. School of Chinese Language and Culture, Nanjing Normal University, Nanjing 210097, China
  • Received:2019-04-04 Online:2020-06-25 Published:2020-04-22
  • Contact: LIANG Dandan E-mail:ldd233@163.com

摘要:

以MMN、p-MMR作为汉语词汇声调感知的神经关联物, 探究2~4岁汉语普通话儿童前注意阶段对声调刺激的失匹配响应, 关注范畴信息和偏差大小两个因素对儿童感知水平的影响。结果显示:在范畴间大偏差条件下(T1/T3), 诱发明显的MMN; 在范畴内或小偏差条件下(T3a/T3、T3b/T3、T2/T3), 都未诱发显著的MMR。表明:2~4岁普通话儿童正处于声调感知能力的发展过程中, 音位信息和声学信息共同影响其声调感知。

关键词: 普通话儿童, 声调感知, 声调范畴, 偏差大小

Abstract:

Lexical tones are a key component of tonal language. The accurate perception of different Mandarin lexical tones is essential for Mandarin-speaking children to process spoken Chinese. Previous studies based on the speech perception model of nontonal language proposed perceptual narrowing theory, while later studies indicated that the perception of lexical tones might be more complicated. Event-related potentials (ERPs) are an effective tool that can investigate Mandarin-speaking children's implicit perception of lexical tones. Some studies targeting children's speech perception have demonstrated that mismatch responses (MMRs, including MMN and p-MMR) indicate the development of phonetic representation. Moreover, these studies have provided empirical evidence in this field. However, ages between 2 and 4 years old needs to be explored empirically. The current study used MMN and p-MMR as the neural correlates of lexical tone perception of Mandarin in the pre-attention stage and investigated the development of lexical tone processing mechanisms in 2- to 4-year-old children. In addition, we paid attention to the influence of category information and the size of the deviance at the acoustic level.

Sixteen 2- to 4-year-old Mandarin-speaking children (7 boys and 9 girls; mean age: 3.4 years old; range: 2.6 - 3.10 years old) were recruited in this study. The study used the oddball paradigm and designed two experiments: Experiment 1 investigated the mismatch responses in across-category lexical tone perception in the participants. The stimuli consisted of three syllables: /yi1/ (T1), /yi2/ (T2), and /yi3/ (T3). T3 was assigned as the standard; T1 was assigned as the large deviant; T2 was the small deviant. This experiment investigated how the deviance size affects children's perception of different lexical tones in the across-category condition. Experiment 2 investigated the mismatch responses of the participants to the perception of tones in the same category and were designated yi3a (T3a) and yi3b (T3b) within the category. These tones have the same phonological information but differ from the standard T3 stimulus in the acoustic information (based on the frequency and contour). The distances between T3a & T3 and T3b & T3 were modulated in Praat to control the distances of T1 & T3 and T2 & T3, respectively. This experiment detected the influence of the degree of similarity on the acoustic information on lexical tone perception without changing the category information.

The results of the EEG data showed that (1) only the across-category large-deviance pair (T1/T3) elicited an obvious MMN response, indicating that 2- to 4-year-old Mandarin-speaking children can distinguish tones with obvious category boundaries in the pre-attention stage; (2) the across-category small-deviance pair (T2/T3) and the two kinds of within-category deviations (T3a/T3; T3b/T3) achieved the same data performance: no significant MMN or p-MMR was elicited. However, the internal mechanisms of these two conditions are different. The former may indicate that 2- to 4-year-old Mandarin-speaking children are in the period of transition from p-MMR to MMN. The latter may reflect that children have established a lexical tone category, and due to their immature perception ability, it is impossible for them to distinguish the differences among within-category lexical tones.

In summary, the current study has filled the age gap in the relevant lexical tone perception neural mechanism research and has revealed what is crucial to children's lexical tone neural mechanism of perception development. Moreover, this research has identified the size difference between isometric across-category stimulation with within-category stimulation, which innovatively provides a reference for future research. The conclusion indicates that 2- to 4-year-old Mandarin-speaking children are in the period of lexical tone category formation. In the pre-attention stage, the obvious category boundary of lexical tones can be distinguished accurately. For the inconspicuous category boundaries of lexical tones, the neural mechanism is transforming from p-MMR to MMN. The magnitude of the deviance does not affect lexical tone perception within the same category.

Key words: Mandarin-speaking children, lexical tone perception, the categories of lexical tones, size of deviant

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