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Alternative TitleCategorical perception of tone in Chinese children with developmental dyslexia
Thesis Advisor毕鸿燕
Degree Grantor中国科学院心理研究所
Place of Conferral中国科学院心理研究所
Degree Name理学硕士
Degree Discipline应用心理学
Keyword发展性阅读障碍 声调范畴间感知 声调范畴内感知 汉语儿童

为揭示发展性阅读障碍的成因,越来越多的研究者开始关注基础的言语感知。范畴感知(categorical perception)是言语感知的一个显著特征,指人们能够将连续变化的语音信号感知为一个个离散的语音范畴,把无数语音分类成有限的语音范畴。采用音段信息,研究发现相比正常阅读者,阅读障碍者对范畴间刺激表现出低敏感缺陷,以及对范畴内刺激表现出过度敏感缺陷。综合范畴间和范畴知缺陷,研究者认为阅读障碍者不但没有建立有效的言语感知信号,反而形成了异常的感知信号。汉语是声调语言,且声调是一种超音段信息。声调不仅具有范畴感知特征,还具有独特的神经加工基础。在汉语阅读中,声调加工发挥着独立且重要的作用。虽然现有研究关注了汉语发展性阅读障碍儿童的声调感知,但基本只考察了阅读障碍儿童的声调范畴间感知。而根据音段信息的研究,阅读障碍者的言语感知异常不仅与范畴间刺激属性有关,还与范畴内刺激属性有关。只有结合范畴间和范畴内的表现,才能全面揭示阅读障碍者的声调范畴感知。因此,本研究采用声调连续体为实验刺激,从行为研究及电生理研究两个水平,全面考察汉语发展性阅读障碍儿童的声调范畴感知。






Other Abstract

More and more researchers have focused on the underlying speech perception to reveal the aetiology of developmental dyslexia. Categorical perception is a significant characteristic of speech perception, indicating that people are able to perceive the continuously changing speech signals as discrete speech categories, and classify the countless speech signals into limited speech categories. Studies with segmental information have found that dyslexics are hyposensitive to the between-categorical stimuli and oversensitive to the within-categorical stimuli compared with typical readers. Combining the between-categorical and within-categorical perception deficits researchers proposed that dyslexics formed the abnormal perception signals instead of establishing the effective speech perception signals. Chinese is a tonal language, and tone is a kind of suprasegmental information. Tone has not only the characteristics of categorical perception, but also the unique neural mechanism. Tone processing plays an independent and crucial role in Chinese reading. Although previous studies have examined the tone perception in Chinese children with developmental dyslexia, these studies mainly focused on between-categorical perception of tone in individuals with dyslexia. According to the studies with segmental information, nonetheless, the perception deficit in individuals with dyslexia is not only related to the between-categorical attribute, but also the within-categorical attribute. Only combining the between- and within-categorical performance, can we systematically reveal the categorical perception of tone in individuals with dyslexia. In this study, hence, we adopted the tonal continua as stimuli, and systematically investigated categorical perception of tone from the behavioral and neural levels in Chinese children with developmental dyslexia.

Children with developmental dyslexia and the corresponding chronological-age control group were recruited as participants. All participants are primary school students at 5th or 6th grade in Beijing. Adopting identification and discrimination tasks, study 1 examined the categorical perception of tone in Chinese children with developmental dyslexia at the behavioral level. Using passive oddball paradigm, study 2 examined the categorical perception of tone in Chinese children with developmental dyslexia at the neural level, with MMN and LDN as the neural markers. We have two important findings.

First, dyslexic children were hyposensitive to the between-categorical stimuli. At the behavioral level, dyslexic children exhibited smaller absolute value of identification slope and lower accuracy in discriminating between-categorical stimuli. At the neural level, compared with chronological-age children, smaller LDN amplitude was found for dyslexic children on the left, middle and right side of the brain. Second, dyslexic children were oversensitive to the within-categorial stimuli. When dyslexic children perceived the within-categorical stimuli, they exhibited larger LVLVIN than chronological-age children on the right side of the brain.

In conclusion, the present study systematically examined the categorical perception of tone in Chinese children with developmental dyslexia from behavioral and neural levels for the first time. The findings showed both the deficit of hyposensitive perception in between-categorical stimuli and the deficit of oversensitive perception in within-categorical stimuli for Chinese children with developmental dyslexia. This study deepens the understanding of the nature of Chinese dyslexia, and provides inspiration for the future intervention and remediation in Chinese children with developmental dyslexia.

Document Type学位论文
Recommended Citation
GB/T 7714
古婵媛. 汉语发展性阅读障碍⼉童的声调范畴感知[D]. 中国科学院心理研究所. 中国科学院心理研究所,2020.
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