Key Laboratory of Brain Cognition and Education Science of Ministry of Education, Guangdong Provincial Key Laboratory of Mental Health and Cognitive Science, Center for Studies of Psychological Application, School of Psychology, South China Normal University, Guangzhou, China.
Key Laboratory of Brain Cognition and Education Science of Ministry of Education, Guangdong Provincial Key Laboratory of Mental Health and Cognitive Science, Center for Studies of Psychological Application, School of Psychology, South China Normal University, Guangzhou, China; Dongguan Dalang No. 1 Middle School, Dongguan, China.
Int J Psychophysiol. 2022 Jul;177:83-91. doi: 10.1016/j.ijpsycho.2022.05.001. Epub 2022 May 6.
Previous studies proposed different views to explain the hemispheric lateralization of lexical tone processing. But how the acoustic and phonological information modulates it remains unclear. The acoustic information refers to the physical acoustic features of lexical tones, and the phonological information means the different word meanings differentiated by lexical tones. In the present study, we adopted the active oddball paradigm to explore the effects of pitch type and lexicality on native Cantonese speakers' lexical tone processing with the event-related potential (ERP) technique. We used Cantonese level and contour tones (pitch type) to examine the role of acoustic information and real words and pseudowords (lexicality) to detect the phonological information's effect. The results showed that the pitch type and lexicality affected the N2b amplitudes between the left and right hemispheres interactively, while they did not play roles in P3b amplitudes. The results indicated that the acoustic and phonological information modulated the hemispheric lateralization of lexical tone processing interactively only in the early stage (N2b time window) but not in the later stage (P3b time window). The findings suggested a two-stage model interprets the hemispheric lateralization in lexical tone processing.
先前的研究提出了不同的观点来解释词汇声调处理的半球侧化。但是，声学和语音信息如何调节它尚不清楚。声学信息是指词汇声调的物理声学特征，而语音信息是指词汇声调区分的不同词义。在本研究中，我们采用主动Oddball 范式，结合事件相关电位（ERP）技术，探讨了音高类型和词汇性对母语广东话使用者词汇声调处理的影响。我们使用广东话的平调和曲折调（音高类型）来检验声学信息的作用，以及使用真实词和假词（词汇性）来检测语音信息的影响。结果表明，音高类型和词汇性在左右半球的 N2b 振幅之间存在交互作用，而在 P3b 振幅中则没有作用。结果表明，声学和语音信息仅在早期（N2b 时间窗口）而非后期（P3b 时间窗口）调节词汇声调处理的半球侧化。这一发现表明，词汇声调处理的半球侧化可以用两阶段模型来解释。
