Leinonen Alina, Laine Mari, Laine Matti, Krause Christina M
Cognitive Science Unit, Department of Psychology, University of Helsinki, Helsinki, Finland.
Neurosci Lett. 2007 Apr 6;416(1):22-7. doi: 10.1016/j.neulet.2006.12.060. Epub 2007 Feb 24.
Event-related desynchronization (ERD) and event-related synchronization (ERS) of the 1-30 EEG frequencies were studied in eight early Finnish-Swedish bilinguals during an auditory bilingual Sternberg memory task using Finnish-Swedish cognates as stimuli. Only subtle differences between languages were expected, since cognates have been assumed to have shared conceptual representations in the bilingual memory. Encoding elicited theta and alpha frequency ERS and beta frequency ERD responses in both languages. Retrieval elicited theta ERS and alpha and beta ERD responses. Some statistically significant differences between encoding and retrieval in Finnish versus Swedish emerged: greater theta and alpha ERS responses were observed during encoding in Swedish than during encoding in Finnish. During between-language retrieval, later-appearing theta ERS and alpha ERD responses were elicited as compared to within-language retrieval. These delayed oscillatory responses might reflect the involvement of central executive attentional functions in relation to language switching.
在一项听觉双语斯特恩伯格记忆任务中，以芬兰语 - 瑞典语同源词为刺激，对8名早期芬兰 - 瑞典语双语者1 - 30赫兹脑电图频率的事件相关去同步化（ERD）和事件相关同步化（ERS）进行了研究。由于同源词在双语记忆中被认为具有共享的概念表征，因此预计两种语言之间只会有细微差异。编码在两种语言中均引发了θ波和α波频率的ERS以及β波频率的ERD反应。检索引发了θ波ERS以及α波和β波ERD反应。芬兰语和瑞典语在编码和检索之间出现了一些统计学上的显著差异：在瑞典语编码期间观察到的θ波和α波ERS反应比芬兰语编码期间更大。在跨语言检索期间，与同语言检索相比，出现了更晚的θ波ERS和α波ERD反应。这些延迟的振荡反应可能反映了中央执行注意功能与语言切换有关的参与情况。
