|Alternative Title||Categorical perception of tone in Chinese children with developmental dyslexia|
|Place of Conferral||中国科学院心理研究所|
|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|
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.
|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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