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  Left posterior-dorsal area 44 couples with parietal areas to promote speech fluency while right area 44 activity promotes the stopping of motor responses

Neef, N., Bütfering, C., Anwander, A., Friederici, A. D., Paulus, W., & Sommer, M. (2016). Left posterior-dorsal area 44 couples with parietal areas to promote speech fluency while right area 44 activity promotes the stopping of motor responses. NeuroImage, 142, 628-644. doi:10.1016/j.neuroimage.2016.08.030.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-2E34-C Version Permalink: http://hdl.handle.net/21.11116/0000-0003-19F9-9
Genre: Journal Article

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 Creators:
Neef, Nicole1, 2, Author              
Bütfering, Christoph1, Author
Anwander, Alfred2, Author              
Friederici, Angela D.2, Author              
Paulus, Walter1, Author
Sommer, Martin1, Author
Affiliations:
1Department of Clinical Neurophysiology, University Medical Center, Göttingen, Germany, ou_persistent22              
2Department Neuropsychology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634551              

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Free keywords: Broca's region; Area 44; Stuttering; Motor imagery; Automaticity; Speech motor control
 Abstract: Area 44 is a cytoarchitectonically distinct portion of Broca's region. Parallel and overlapping large-scale networks couple with this region thereby orchestrating heterogeneous language, cognitive and motor functions. In the context of stuttering, area 44 frequently comes into focus because structural and physiological irregularities affect developmental trajectories, stuttering severity, persistency, and etiology. A remarkable phenomenon accompanying stuttering is the preserved ability to sing. Speaking and singing are connatural behaviours recruiting largely overlapping brain networks including left and right area 44. Analysing which potential subregions of area 44 are malfunctioning in adults who stutter, and what effectively suppresses stuttering during singing, may provide a better understanding of the coordination and reorganization of large-scale brain networks dedicated to speaking and singing in general. We used fMRI to investigate functionally distinct subregions of area 44 during imagery of speaking and imaginary of humming a melody in 15 dextral males who stutter and 17 matched control participants. Our results are fourfold. First, stuttering was specifically linked to a reduced activation of left posterior-dorsal area 44, a subregion that is involved in speech production, including phonological word processing, pitch processing, working memory processes, sequencing, motor planning, pseudoword learning, and action inhibition. Second, left posterior-area-44-to-parietal functional coupling was deficient in stuttering. Third, despite the preserved ability to sing, males who stutter showed bilaterally a reduced activation of area 44 when imagine humming a melody, suggesting that this fluency-enhancing condition seems to bypass posterior-dorsal area 44 to achieve fluency. Fourth, time courses of the posterior subregions in area 44 showed delayed peak activations in the right hemisphere in both groups, possibly signaling the offset response. Because these offset response-related activations in the right hemisphere were comparably large in males who stutter, our data suggest a hyperactive mechanism to stop speech motor responses and thus possibly reflect a pathomechanism, which, until now, has been neglected. Overall, the current results confirmed a recently described co-activation based parcellation supporting the idea of functionally distinct subregions of left area 44.

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Language(s): eng - English
 Dates: 2016-06-052016-08-152016-08-162016-11-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.neuroimage.2016.08.030
PMID: 27542724
Other: Epub 2016
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Title: NeuroImage
Source Genre: Journal
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Pages: - Volume / Issue: 142 Sequence Number: - Start / End Page: 628 - 644 Identifier: ISSN: 1053-8119
CoNE: /journals/resource/954922650166