Word recognition semantic processing defects in Chinese children with developmental dyslexia: An event-related potential study

Abstract

Wang E., Word recognition semantic processing defects in Chinese children with developmental dyslexia: An event-related potential study eISSN 1303-5150 www.neuroquantology.com ABSTRACTThis study reports the neurophysiological and behavioral correlates of lexical decision processes in Chinesespeaking dyslexic and non-dyslexic readers in order to understand the neural basis of dyslexia. Eighteen dyslexic children (ages 12~14) and 18 matched control children were tested, and the event-related potentials (ERPs) to real words and pseudo-words were recorded simultaneously with behavioral measures. The results showed that both groups had significantly longer response time for the pseudo-words. Furthermore, overall performance (in terms of lower accuracy and longer response time) was significantly worse among the dyslexic group during the lexical decision task. The differences between the dyslexic and control groups were mainly in the N130, RP, N400, and P600 components. The results suggest that Chinese dyslexic children have semantic processing defects. From a time course point of view, the early stages of processing reflect the Chinese dyslexic children's morpheme integration and category sorting capacity deficiencies, while the middle stages show their semantic integration difficulties. The later stages of processing show that during semantic processing, decision-making is difficult among these children. Based on Chinese characters and phonetic system similarities, we suggest there are semantic processing defects in Chinese dyslexic children.

Age of acquisition ratings for 19,716 simplified Chinese words

“…For example, the LCMC (Lancaster Corpus of Mandarin Chinese; McEnery & Xiao, 2004) and the ToRCH (Text of Recent CHinese; Xu, 2017) each contain about 70% twocharacter words. Our word sample accordingly consisted of largely two-character words, which seem to be the focus of many psycholinguistic studies (e.g., Du, Zhang, & Zhang, 2014;Wang et al, 2016, Wang et al, 2017Zhang et al, 2004). Although we included all three-and four-character words in MELD-SCH, a more comprehensive word sample including characters or single-character words would be beneficial to a wider range of research areas, e.g., natural language processing.…”

sLORETA Source Localization in Dyslexic Children during Different Congruency of Visual Images: P300 Component Analysis

“…Tumpuan visual yang berbeza dalam pelbagai jenis karakteristik stimulasi visual dapat dilihat dalam objek urutan pantas (Visser, Boden & Giaschi 2004), peralihan ruang objek (Buchholz & Aimola 2005), objek pseudo (Mayseless dan Breznitz 2011) dan stimulasi visual bersifat linguistik dan struktur bahasa (Wang, Du & Huang 2017). Namun, kesemua kajian tersebut terbatas kepada maklumat berkaitan pemprosesan neural, dan tidak pada penetapan sumber aktiviti otak dalam fungsi kognitif visual.…”