Dehaene S, Dupoux E, Mehler J, Cohen L, Paulesu E, Perani D, van de Moortele P F, Lehéricy S, Le Bihan D
Laboratoire de Sciences Cognitives et Psycholinguistique, EHESS/CNRS URA 1198, Paris, France.
Neuroreport. 1997 Dec 1;8(17):3809-15. doi: 10.1097/00001756-199712010-00030.
Functional magnetic resonance imaging was used to assess inter-subject variability in the cortical representation of language comprehension processes. Moderately fluent French-English bilinguals were scanned while they listened to stories in their first language (L1 = French) or in a second language (L2 = English) acquired at school after the age of seven. In all subjects, listening to L1 always activated a similar set of areas in the left temporal lobe, clustered along the left superior temporal sulcus. Listening to L2, however, activated a highly variable network of left and right temporal and frontal areas, sometimes restricted only to right-hemispheric regions. These results support the hypothesis that first language acquisition relies on a dedicated left-hemispheric cerebral network, while late second language acquisition is not necessarily associated with a reproducible biological substrate. The postulated contribution of the right hemisphere to L2 comprehension is found to hold only on average, individual subjects varying from complete right lateralization to standard left lateralization for L2.
功能磁共振成像被用于评估语言理解过程的皮质表征中的个体间变异性。对中等流利程度的法英双语者进行扫描，让他们听用其母语（L1 = 法语）或七岁后在学校习得的第二语言（L2 = 英语）讲述的故事。在所有受试者中，听L1总是激活左颞叶中一组相似的区域，这些区域沿着左颞上沟聚集。然而，听L2时，激活的是左右颞叶和额叶区域组成的高度可变网络，有时仅局限于右半球区域。这些结果支持了以下假设：第一语言习得依赖于专门的左半球脑网络，而第二语言的后期习得不一定与可重复的生物学基质相关。发现右半球对L2理解的假定贡献仅在平均水平上成立，个体受试者在L2的完全右侧化到标准左侧化之间存在差异。
