Lateralized frontal activity for Japanese phonological processing during child development

Takaaki Goto, Yosuke Kita, Kota Suzuki, Toshihide Koike, Masumi Inagaki

研究成果: Article査読

6 被引用数 (Scopus)

抄録

Phonological awareness is essential for reading, and is common to all language systems, including alphabetic languages and Japanese. This cognitive factor develops during childhood, and is thought to be associated with shifts in brain activity. However, the nature of this neurobiological developmental shift is unclear for speakers of Japanese, which is not an alphabetical language. The present study aimed to reveal a shift in brain functions for processing phonological information in native-born Japanese children. We conducted a phonological awareness task and examined hemodynamic activity in 103 children aged 7–12 years. While younger children made mistakes and needed more time to sort phonological information in reverse order, older children completed the task quickly and accurately. Additionally, younger children exhibited increased activity in the bilateral dorsolateral prefrontal cortex (DLPFC), which may be evidence of immature phonological processing skills. Older children exhibited dominant activity in the left compared with the right DLPFC, suggesting that they had already acquired phonological processing skills. We also found significant effects of age and lateralized activity on behavioral performance. During earlier stages of development, the degree of left lateralization appears to have a smaller effect on behavioral performance. Conversely, in later stages of development, the degree of left lateralization appears to have a stronger influence on behavioral performance. These initial findings regarding a neurobiological developmental shift in Japanese speakers suggest that common brain regions play a critical role in the development of phonological processing skills among different languages systems, such as Japanese and alphabetical languages.

本文言語English
論文番号417
ジャーナルFrontiers in Human Neuroscience
9
JULY
DOI
出版ステータスPublished - 2015 7月 17
外部発表はい

ASJC Scopus subject areas

  • 神経心理学および生理心理学
  • 神経学
  • 精神医学および精神衛生
  • 生物学的精神医学
  • 行動神経科学

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