【作者】 朱祖德； 冯刚毅； 李国超； 王穗苹；

【Author】 Zhu Zude Feng Gangyi Li Guochao Wang Suiping Center for the Study of Applied Psychology,South China Normal University,Guangzhou,510631

【机构】 华南师范大学,心理应用研究中心；

【摘要】 语义整合是指在语言理解过程中将字词整合到语境中帮助读者形成联贯的意义表征。不同理论对于语义整合与一般认知控制加工是否涉及相同的神经机制还存在争论。本研究收集了26名健康成年被试的fMRI数据以考察语义整合的神经机制。实验包括语义合理性判断,探测句子字体变化和Stroop三种任务,每种任务以单独的组块形式完成,在前两种任务中实验材料都是三种语义整合难度不同的句子。分析发现,在Stroop任务中与认知控制加工相关的区域为左侧额下回后部;而在语义合理性判断和探测字体变化任务中,语义整合难度引发的激活除了左侧额下回后部外还包括左侧额下回前部。通过结构方程建模进一步发现,左侧额下回后部的BOLD信号能预测语义合理性判断任务和Stroop任务的反应时,但是前部的BOLD信号只能预测语义合理性判断任务的反应时。这一结果表明,左侧额下回前部和后部在功能上存在一定程度的分离,前部在语义整合中起重要作用,而后部参与一般认知控制加工。更多还原

【Abstract】 Whether semantic unification shares the neural basis with general cognitive control is a debated issue.To shed light to this issue,three kinds of tasks including semantic congruency judgment(SEM),font size change detection(FONT) and Stroop task were adopted in the present fMRI study with 26 health adults.Three kinds of sentences with varied semantic unification difficulty were presented in SEM and FONT.Interference effect was observed in posterior left inferior frontal gyrus(pLIFG) in Stroop task. Semantic unification effect was additionally observed in anterior left inferior frontal gyrus(aLIFG).Furthermore,structure equation modeling analysis showed that BOLD signal change in pLIFG contributed to reaction time(RT) in both SEM and Stroop,but the counterpart in aLIFG only significantly predicted RT in SEM.Taking all together,these results demonstrated that aLIFG is important for semantic unification per se,while pLIFG is important for general cognitive control.更多还原