Speaking in multiple languages: Neural correlates of language proficiency in multilingual word production

• Published in: Brain and language 2010-06, Vol.113 (3), p.103-112
• Main Authors: Videsott, Gerda, Herrnberger, Bärbel, Hoenig, Klaus, Schilly, Edgar, Grothe, Jo, Wiater, Werner, Spitzer, Manfred, Kiefer, Markus
• Format: Article
• Language: English
• Subjects: Adult; Bilingualism. Multilingualism; Biological and medical sciences; Brain - physiology; Brain Hemisphere Functions; Brain Mapping; Cognitive science; Correlation; Diagnostic Tests; English (Second Language); Female; Foreign Countries; Functional Laterality; Functional magnetic resonance imaging; Fundamental and applied biological sciences. Psychology; Humans; Italian; Italy; Language; Language Fluency; Language Processing; Language Proficiency; Language Tests; Magnetic Resonance Imaging; Male; Multilingualism; Neuroscience; Pattern Recognition, Visual - physiology; Picture naming; Prefrontal Cortex - physiology; Psychology. Psychoanalysis. Psychiatry; Psychology. Psychophysiology; Right prefrontal cortex; Role; Romance Languages; Second Language Learning; Speech - physiology; Vocabulary; Word retrieval; Young Adult
• ISSN: 0093-934X; 1090-2155
• DOI: 10.1016/j.bandl.2010.01.006

The human brain has the fascinating ability to represent and to process several languages. Although the first and further languages activate partially different brain networks, the linguistic factors underlying these differences in language processing have to be further specified. We investigated the neural correlates of language proficiency in a homogeneous sample of multilingual native Ladin speakers from a mountain valley in South Tyrol, Italy, who speak Italian as second language at a high level, and English at an intermediate level. In a constrained word production task under functional magnetic resonance imaging (fMRI), participants had to name pictures of objects in Ladin, Italian and English in separate blocks. Overall, multilingual word production activated a common set of brain areas dedicated to known subcomponents of picture naming. In comparison to English, the fluently spoken languages Ladin and Italian were associated with enhanced right prefrontal activity. In addition, the MR signal in right prefrontal cortex correlated with naming accuracy as a measure of language proficiency. Our results demonstrate the significance of right prefrontal areas for language proficiency. Based on the role of these areas for cognitive control, our findings suggest that right prefrontal cortex supports language proficiency by effectively supervising word retrieval.