Laboratoire de Neurosciences Cognitives, UMR 7291, CNRS - Aix-Marseille University, Marseille, France.
Laboratoire de Neurosciences Cognitives, UMR 7291, CNRS - Aix-Marseille University, Marseille, France.
Cortex. 2019 Apr;113:111-127. doi: 10.1016/j.cortex.2018.11.024. Epub 2018 Dec 10.
Current models of writing assume that the orthographic processes involved in spelling retrieval and the motor processes involved in the control of the hand are independent. This view has been challenged by behavioral studies, which showed that the linguistic features of words impact motor execution during handwriting. We designed an experiment coupling functional magnetic resonance imaging and kinematic recordings during a writing to dictation task. Participants wrote orthographically regular and irregular words. The presence of an irregularity impacts both the initiation of the movement and its fine motor execution. At the brain level, the left inferior frontal and fusiform gyri, two regions belonging to the core of the written language system, were found to be sensitive to the presence of an irregularity and to its position in the word during writing execution. Moreover, the left superior parietal lobule, the left superior frontal gyrus and the right cerebellum, three motor-related regions, displayed a stronger response to irregular than regular words. These results constitute direct evidence that orthographic and motor processes occur in a continuous and interactive fashion during writing.
目前的写作模型假设拼写检索所涉及的正字法过程和手部控制所涉及的运动过程是相互独立的。这一观点受到了行为研究的挑战，这些研究表明，单词的语言特征会影响手写过程中的运动执行。我们设计了一项实验，在写作到听写任务期间结合功能磁共振成像和运动记录。参与者书写正字法规则和不规则单词。不规则性的存在会影响运动的启动及其精细运动执行。在大脑水平上，发现左侧额下回和梭状回两个属于书面语言系统核心的区域对不规则性的存在以及在书写执行过程中单词的位置敏感。此外，三个与运动相关的区域，即左顶叶上回、左额上回和右小脑，对手写时的不规则词的反应比规则词更强。这些结果直接证明了在书写过程中，正字法和运动过程以连续和互动的方式发生。
