Department of Psychology, Liaoning Normal University, Dalian 116029, China.
Neuroscience. 2009 Dec 29;164(4):1623-31. doi: 10.1016/j.neuroscience.2009.09.029. Epub 2009 Sep 23.
The aim of the present study was to examine the pattern of phonological activation during Chinese sentence reading. Terminal words in high cloze sentences were manipulated across six conditions defined by word frequency and ending types. The P200 was smaller for the congruent targets than for the unrelated control targets, while there were no differences between the homophonic and unrelated control targets. No frequency effect on the P200 was observed. More importantly, a reduced N400 to the homophonic words was observed independent of word frequency. Source analysis by low resolution electromagnetic tomography (LORETA) revealed that the highly activated areas for the P200 were located at bilateral superior frontal (BA 6) and occipital (BA 17, 18 and 19) areas, while the N400 was located at left medial frontal (BA 6) area. These findings suggest that phonology is activated automatically for both high- and low-frequency words during Chinese sentence reading, even when the task is not focused on pronunciation.
本研究旨在考察汉语句子阅读过程中的语音激活模式。在六个条件下操纵高 cloze 句子中的结尾词，这些条件由词频和结尾类型定义。与不相关的控制目标相比，一致的目标的 P200 更小，而同音词和不相关的控制目标之间没有差异。P200 上没有观察到频率效应。更重要的是，观察到同音词的 N400 减小，而与词频无关。通过低分辨率电磁断层扫描（LORETA）进行的源分析显示，P200 的高激活区域位于双侧额上（BA6）和枕部（BA17、18 和 19）区域，而 N400 位于左侧内侧额（BA6）区域。这些发现表明，即使任务不专注于发音，在阅读汉语句子时，高频和低频词都会自动激活语音。
