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          Institute: MPI für Psycholinguistik     Collection: Unification     Display Documents

ID: 394937.0, MPI für Psycholinguistik / Unification
The inferior frontal cortex in artificial syntax processing: An rTMS study
Authors:Uddén, Julia; Folia, Vasiliki; Forkstam, Christian; Ingvar, Martin; Fernandez, Guillen; Overeem, Sebastiaan; Van Elswijk, Gijs; Hagoort, Peter; Petersson, Karl Magnus
Date of Publication (YYYY-MM-DD):2008
Title of Journal:Brain Research
Start Page:69
End Page:78
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The human capacity to implicitly acquire knowledge of structured sequences has recently been investigated in artificial grammar learning using functional magnetic resonance imaging. It was found that the left inferior frontal cortex (IFC; Brodmann's area (BA) 44/45) was related to classification performance. The objective of this study was to investigate whether the IFC (BA 44/45) is causally related to classification of artificial syntactic structures by means of an off-line repetitive transcranial magnetic stimulation (rTMS) paradigm. We manipulated the stimulus material in a 2 × 2 factorial design with grammaticality status and local substring familiarity as factors. The participants showed a reliable effect of grammaticality on classification of novel items after 5days of exposure to grammatical exemplars without performance feedback in an implicit acquisition task. The results show that rTMS of BA 44/45 improves syntactic classification performance by increasing the rejection rate of non-grammatical items and by shortening reaction times of correct rejections specifically after left-sided stimulation. A similar pattern of results is observed in FMRI experiments on artificial syntactic classification. These results suggest that activity in the inferior frontal region is causally related to artificial syntax processing.
External Publication Status:published
Document Type:Article
Communicated by:Peter Hagoort
Affiliations:MPI für Psycholinguistik
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