汉语具体词和抽象词记忆的神经机制研究

Neural Mechanism Subserving Memory of Chinese Abstract and Concrete Words

  • 摘要: 具体词和抽象词加工的神经机制是认知神经科学的研究热点,但过往的相关研究主要集中于拼音文字,发现抽象词加工更多激活语言系统,而具体词加工更多激活感知觉系统。该文使用功能性磁共振成像,通过记忆−自由回忆任务,探究了汉语具体词和抽象词加工在记忆编码过程中的大脑活动情况,结果是两种词类的记忆加工都主要激活了颞枕皮层和左侧额下回。除此之外,抽象词记忆更多激活了默认脑网络,而具体词记忆更多激活了感觉运动皮层。结果表明具体词和抽象词的记忆都会激活语言和执行控制系统,但也会依赖不同的脑区进行记忆编码。

     

    Abstract: The neural mechanism subserving the processing of abstract and concrete words is widely studied in cognitive neuroscience. The previous studies focused on the alphabetic languages, which found that the processing of abstract words relies more on verbal system and the processing of concrete words relies more on perceptual system. This study investigates the brain activity elicited by the abstract and concrete words in the process of the memory encoding with functional magnetic resonance imaging. The results are that the memory encoding of the two types of words activates temporal-occipital cortex and left inferior frontal gyrus. Besides, abstract words elicit default mode network additionally while concrete words elicit sensorimotor cortex additionally. The results indicate that the memory of the abstract and concrete words activates verbal and executive control systems, but they also rely on different systems for memory encoding.

     

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