An fMRI study dissociating distance measures computed by Broca's area in movement processing: clause boundary vs. identity

Andrea Santi*, Angela D. Friederici, Michiru Makuuchi, Yosef Grodzinsky

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Behavioral studies of sentence comprehension suggest that processing long-distance dependencies is subject to interference effects when Noun Phrases (NP) similar to the dependency head intervene in the dependency. Neuroimaging studies converge in localizing such effects to Broca's area, showing that activity in Broca's area increases with the number of NP interveners crossed by a moved NP of the same type. To test if NP interference effects are modulated by adding an intervening clause boundary, which should by hypothesis increase the number of successive-cyclic movements, we conducted an fMRI study contrasting NP interveners with clausal (CP) interveners. Our design thus had two components: (I) the number of NP interveners crossed by movement was parametrically modulated; (II) CP-intervention was contrasted with NP-intervention. The number of NP interveners parametrically modulated a cluster straddling left BA44/45 of Broca's area, replicating earlier studies. Adding an intervening clause boundary did not significantly modulate the size of the NP interference effect in Broca's area. Yet, such an interaction effect was observed in the Superior Frontal Gyrus (SFG). Therefore, the involvement of Broca's area in processing syntactic movement is best captured by memory mechanisms affected by a grammatically instantiated type-identity (i.e., NP) intervention.

Original languageEnglish
Article number654
JournalFrontiers in Psychology
StatePublished - 20 May 2015
Externally publishedYes


FundersFunder number
Edmond and Lily Safra Center for Brain Research
Alexander von Humboldt-Stiftung
Social Sciences and Humanities Research Council of Canada410-2009-0431
European Research CouncilERC-2010-360 AdG20100407
Canada Research Chairs
Bundesministerium für Bildung und Forschung01GW0773


    • Broca's area
    • fMRI
    • movement
    • syntactic processing
    • working memory


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