fMRI adaptation dissociates syntactic complexity dimensions

Andrea Santi*, Yosef Grodzinsky

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

104 Scopus citations

Abstract

The current fMRI adaptation study sought to elucidate the dimensions of syntactic complexity and their underlying neural substrates. For the first time with fMRI, we investigated repetition suppression (i.e., fMRI adaptation) for two orthogonal dimensions of sentence complexity: embedding position (right-branching vs. center-embedding) and movement type (subject vs. object). Two novel results were obtained: First, we found syntactic adaptation in Broca's area and second, this adaptation was structured. Anterior Broca's area (BA 45) selectively adapted to movement type, while posterior Broca's area (BA 44) demonstrated adaptation to both movement type and embedding position (as did left posterior superior temporal gyrus and right inferior precentral sulcus). The functional distinction within Broca's area is critical not only to an understanding of the functional neuroanatomy of language, but also to theoretical accounts of syntactic complexity, demonstrating its multi-dimensional nature. These results implicate that during syntactic comprehension, a large network of areas is engaged, but that only anterior Broca's area is selective to syntactic movement.

Original languageAmerican English
Pages (from-to)1285-1293
Number of pages9
JournalNeuroImage
Volume51
Issue number4
DOIs
StatePublished - Jul 2010
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by a Canada Research Chairs grant, by a SSHRC standard grant, and by NIH grant DC000494 (YG), and a Natural Sciences and Engineering Research Council (NSERC) scholarship, and Lloyd Carr-Harris Fellowship (AS).

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