Institute of Linguistics, Academia Sinica, Taipei, Taiwan.
Department of Psychology, University of Southern California, Los Angeles, CA, United States.
Brain Lang. 2021 Aug;219:104961. doi: 10.1016/j.bandl.2021.104961. Epub 2021 May 6.
Previous studies have shown that reading experience reshapes speech processing. The orthography can be implemented in the brain by restructuring the phonological representations or being co-activated during spoken word recognition. This study utilized event-related functional magnetic resonance imaging and functional connectivity analysis to examine the neural mechanism underlying two types of orthographic effects in the Chinese auditory semantic category task, namely phonology-to-orthography consistency (POC) and homophone density (HD). We found that the POC effects originated from the speech network, suggesting that sublexical orthographic information could change the organization of preexisting phonological representations when learning to read. Meanwhile, the HD effects were localized to the left fusiform and lingual gyrus, suggesting that lexical orthographic knowledge may be activated online during spoken word recognition. These results demonstrated the different natures and neural mechanisms for the POC and HD effects on Chinese spoken word recognition.
先前的研究表明，阅读经验会重塑语音处理。在语音识别过程中，正字法可以通过重新构建语音表征或同时激活来在大脑中实现。本研究采用事件相关功能磁共振成像和功能连接分析，来考察中文听觉语义范畴任务中两种正字法效应（即语音到正字法一致性和同音字密度）的神经机制。我们发现，语音到正字法一致性效应源自语音网络，这表明在学习阅读时，亚词汇正字法信息可以改变预先存在的语音表征的组织。同时，同音字密度效应定位于左侧梭状回和舌回，这表明在语音识别过程中，词汇正字法知识可能会在线激活。这些结果表明，在中文口语识别中，语音到正字法一致性效应和同音字密度效应具有不同的性质和神经机制。
