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Cortical representation of auricular muscles in humans: a robot-controlled TMS mapping and fMRI study

BACKGROUND: Most humans have the ability to activate the auricular muscles. Although (intentional) control suggests an involvement of higher cortical centers underlying posterior auricular muscle (PAM) activation, the cortical representation of the auricular muscles is still unknown. - METHODS: With...

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Main Authors: Meincke, Jonna (Author) , Hewitt, Manuel (Author) , Reischl, Markus (Author) , Rupp, Rüdiger (Author) , Schmidt-Samoa, Carsten (Author) , Liebetanz, David (Author)
Format: Article (Journal)
Language:English
Published: July 27, 2018
In: PLOS ONE
Year: 2018, Volume: 13, Issue: 7
ISSN:1932-6203
DOI:10.1371/journal.pone.0201277
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1371/journal.pone.0201277
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Author Notes:Jonna Meincke, Manuel Hewitt, Markus Reischl, Rüdiger Rupp, Carsten Schmidt-Samoa, David Liebetanz

MARC

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520 |a BACKGROUND: Most humans have the ability to activate the auricular muscles. Although (intentional) control suggests an involvement of higher cortical centers underlying posterior auricular muscle (PAM) activation, the cortical representation of the auricular muscles is still unknown. - METHODS: With the purpose of identifying a possible cortical representation area we performed automated robotic and image-guided transcranial magnetic stimulation (TMS) mapping (n = 8) and functional magnetic resonance imaging (fMRI) (n = 13). For topographical comparison, a similar experimental protocol was applied for the first dorsal interosseus muscle (FDI) of the hand. - RESULTS: The calculated centers of gravity (COGs) of both muscles were located on the precentral gyrus with the PAM COGs located more laterally compared to the FDI. The distance between the mean PAM and mean FDI COG was 26.3 mm. The TMS mapping results were confirmed by fMRI, which showed a dominance of cortical activation within the precentral gyrus during the corresponding motor tasks. The correspondence of TMS and fMRI results was high. - CONCLUSION: The involvement of the primary motor cortex in PAM activation might point to an evolved function of the auricular muscles in humans and/or the ability of intentional (and selective) muscle activation. 
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