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  Different neural capacity limitations for articulatory and non-articulatory maintenance of verbal information

Trapp, S., Mueller, K., Lepsien, J., Krämer, B., & Gruber, O. (2014). Different neural capacity limitations for articulatory and non-articulatory maintenance of verbal information. Experimental Brain Research, 232(2), 619-628. doi:10.1007/s00221-013-3770-3.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-C5BF-F Version Permalink: http://hdl.handle.net/21.11116/0000-0003-7F04-B
Genre: Journal Article

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 Creators:
Trapp, Sabrina1, Author              
Mueller, Karsten2, Author              
Lepsien, Jöran2, Author              
Krämer, Bernd3, Author
Gruber, Oliver3, Author
Affiliations:
1Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634549              
2Methods and Development Unit Nuclear Magnetic Resonance, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634558              
3Department of Psychiatry and Psychotherapy, Centre for Translational Research in Systems Neuroscience and Clinical Psychiatry, Georg August University, Göttingen, Germany, ou_persistent22              

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Free keywords: Verbal working memory; Load; Neuroimaging; Capacity limitation; Language; Degeneracy
 Abstract: Many studies have demonstrated attenuated verbal working memory (WM) under articulatory suppression. However, performance is not completely abolished, suggesting a less efficient, non-articulatory mechanism for the maintenance of verbal information. The neural causes for the reduced efficiency of such a putative complementary maintenance system have not yet been addressed. The present study was conducted to fill this gap. Subjects performed a Sternberg task (a) under articulatory maintenance at low, high, and supracapacity set sizes and (b) under non-articulatory maintenance at low and high set sizes. With functional magnetic resonance imaging, set-size related increases in activity were compared between subvocal articulatory rehearsal and non-articulatory maintenance. First, the results replicate previous findings showing different networks underlying these two maintenance strategies. Second, activation of all key nodes of the articulatory maintenance network increased with the amount of memorized information, showing no plateau at high set sizes. In contrast, for non-articulatory maintenance, there was evidence for a plateau at high set sizes in all relevant areas of the network. Third, for articulatory maintenance, the non-articulatory maintenance network was additionally recruited at supracapacity set sizes, presumably to assist processing in this highly demanding condition. This is the first demonstration of differential neural bottlenecks for articulatory and non-articulatory maintenance. This study adds to our understanding of the performance differences between these two strategies supporting verbal WM.

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Language(s): eng - English
 Dates: 2013-01-232013-11-112013-12-102014-02
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1007/s00221-013-3770-3
PMID: 24322820
Other: Epub 2013
 Degree: -

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Title: Experimental Brain Research
  Other : Exp. Brain Res.
Source Genre: Journal
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Publ. Info: Heidelberg : Springer-Verlag
Pages: - Volume / Issue: 232 (2) Sequence Number: - Start / End Page: 619 - 628 Identifier: ISSN: 0014-4819
CoNE: https://pure.mpg.de/cone/journals/resource/954925398496