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  Brain signature of working memory for sentence structure: Enriched encoding and facilitated maintenance

Bonhage, C., Fiebach, C. J., Bahlmann, J., & Mueller, J. L. (2014). Brain signature of working memory for sentence structure: Enriched encoding and facilitated maintenance. Journal of Cognitive Neuroscience, 26(8), 1654-1671. doi:10.1162/jocn_a_00566.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-F501-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-81D0-F
Genre: Journal Article

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 Creators:
Bonhage, Corinna1, Author              
Fiebach, Christian J.2, 3, Author
Bahlmann, Jörg4, Author              
Mueller, Jutta L.1, 5, Author              
Affiliations:
1Department Neuropsychology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634551              
2Goethe University, Frankfurt, Germany, ou_persistent22              
3Center for Individual Development and Adaptive Education, Frankfurt, Germany, ou_persistent22              
4University of Lübeck, Germany, ou_persistent22              
5University of Osnabrück, Germany, ou_persistent22              

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 Abstract: Sentences are easier to memorize than ungrammatical word strings, a phenomenon known as the sentence superiority effect. Yet, it is unclear how higher-order linguistic information facilitates verbal working memory and how this is implemented in the neural system. The goal of the current fMRI study was to specify the brain mechanisms underlying the sentence superiority effect during encoding and during maintenance in working memory by manipulating syntactic structure and working memory load. The encoding of sentence material, as compared with the encoding of ungrammatical word strings, recruited not only inferior frontal (BA 47) and anterior temporal language-related areas but also the medial-temporal lobe, which is not classically reported for language tasks. During maintenance, it was sentence structure as contrasted to ungrammatical word strings that led to activation decrease in Broca's area, SMA, and parietal regions. Furthermore, in Broca's area, an interaction effect revealed a load effect for ungrammatical word strings but not for sentences. The sentence superiority effect, thus, is neurally reflected in a twofold pattern, consisting of increased activation in classical language as well as memory areas during the encoding phase and decreased maintenance-related activation. This pattern reflects how chunking, based on sentential syntactic and semantic information, alleviates rehearsal demands and thus leads to improved working memory performance.

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Language(s): eng - English
 Dates: 2014-01-092014-08
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1162/jocn_a_00566
PMID: 24405186
Other: Epub 2014
 Degree: -

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Title: Journal of Cognitive Neuroscience
Source Genre: Journal
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Publ. Info: Cambridge, MA : MIT Press Journals
Pages: - Volume / Issue: 26 (8) Sequence Number: - Start / End Page: 1654 - 1671 Identifier: ISSN: 0898-929X
CoNE: /journals/resource/991042752752726