Key Laboratory of Behavioral Science, Institute of Psychology, Chinese Academy of Science, Beijing, China.
PLoS One. 2012;7(3):e33337. doi: 10.1371/journal.pone.0033337. Epub 2012 Mar 13.
Both the ventral and dorsal visual streams in the human brain are known to be involved in reading. However, the interaction of these two pathways and their responses to different cognitive demands remains unclear. In this study, activation of neural pathways during Chinese character reading was acquired by using a functional magnetic resonance imaging (fMRI) technique. Visual-spatial analysis (mediated by the dorsal pathway) was disassociated from lexical recognition (mediated by the ventral pathway) via a spatial-based lexical decision task and effective connectivity analysis. Connectivity results revealed that, during spatial processing, the left superior parietal lobule (SPL) positively modulated the left fusiform gyrus (FG), while during lexical processing, the left SPL received positive modulatory input from the left inferior frontal gyrus (IFG) and sent negative modulatory output to the left FG. These findings suggest that the dorsal stream is highly involved in lexical recognition and acts as a top-down modulator for lexical processing.
已知人类大脑中的腹侧和背侧视觉流都参与阅读。然而，这两个途径的相互作用及其对不同认知需求的反应仍不清楚。在这项研究中，使用功能磁共振成像（fMRI）技术获得了汉字阅读过程中神经通路的激活。通过基于空间的词汇决策任务和有效连接分析，将视觉空间分析（由背侧通路介导）与词汇识别（由腹侧通路介导）分离。连接结果表明，在空间处理过程中，左顶下小叶（SPL）正向调节左侧梭状回（FG），而在词汇处理过程中，左 SPL 接收到来自左侧额下回（IFG）的正向调节输入，并将负向调节输出发送到左侧 FG。这些发现表明，背侧流高度参与词汇识别，并作为词汇处理的自上而下的调节剂。
