Kiefer M, Weisbrod M, Kern I, Maier S, Spitzer M
University of Heidelberg, Psychiatric Hospital, Section for Experimental Psychopathology, Germany
Brain Lang. 1998 Oct 1;64(3):377-408. doi: 10.1006/brln.1998.1979.
Healthy subjects performed a lexical decision task in a semantic priming paradigm while event-related potentials (ERPs) were recorded from 64 channels. Semantic distance between prime and target was varied by including directly, indirectly, and nonrelated word pairs. At centro-parietal electrodes an N400 to nonrelated pairs was elicited bilaterally which was sensitive only to direct, but not to indirect semantic priming. These N400 priming effects were mirrored by the RT data. At inferior fronto-temporal sites directly related words showed ERP priming effects over both hemispheres. However, indirectly related words only elicited ERP priming effects over the right hemisphere. These results support the hypothesis that the right hemisphere semantic system is involved in processing of remote semantic information.
健康受试者在语义启动范式下执行词汇判断任务，同时从64个通道记录事件相关电位（ERP）。通过纳入直接、间接和不相关的词对来改变启动词和目标词之间的语义距离。在中央顶叶电极处，双侧诱发了对不相关词对的N400，其仅对直接语义启动敏感，而对间接语义启动不敏感。这些N400启动效应在反应时数据中得到反映。在额颞下部位点，直接相关的词在两个半球均显示出ERP启动效应。然而，间接相关的词仅在右半球诱发ERP启动效应。这些结果支持了右半球语义系统参与远程语义信息加工的假设。
