Stroking or Buzzing? A Comparison of Somatosensory Touch Stimuli Using 7 Tesla fMRI.

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Version: Final published version
Serval ID
serval:BIB_229C30AC76E5
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Stroking or Buzzing? A Comparison of Somatosensory Touch Stimuli Using 7 Tesla fMRI.
Journal
Plos One
Author(s)
van der Zwaag W., Gruetter R., Martuzzi R.
ISSN
1932-6203 (Electronic)
ISSN-L
1932-6203
Publication state
Published
Issued date
2015
Peer-reviewed
Oui
Volume
10
Number
8
Pages
e0134610
Language
english
Notes
Publication types: Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: epublish
Abstract
Studying body representations in the brain helps us to understand how we humans relate to our own bodies. The in vivo mapping of the somatosensory cortex, where these representations are found, is greatly facilitated by the high spatial resolution and high sensitivity to brain activation available at ultra-high field. In this study, the use of different stimulus types for somatotopic mapping of the digits at ultra-high field, specifically manual stroking and mechanical stimulation, was compared in terms of sensitivity and specificity of the brain responses. Larger positive responses in digit regions of interest were found for manual stroking than for mechanical stimulation, both in terms of average and maximum t-value and in terms of number of voxels with significant responses to the tactile stimulation. Responses to manual stroking were higher throughout the entire post-central sulcus, but the difference was especially large on its posterior wall, i.e. in Brodmann area 2. During mechanical stimulation, cross-digit responses were more negative than during manual stroking, possibly caused by a faster habituation to the stimulus. These differences indicate that manual stroking is a highly suitable stimulus for fast somatotopic mapping procedures, especially if Brodmann area 2 is of interest.
Keywords
Adult, Brain Mapping, Female, Humans, Magnetic Resonance Imaging, Male, Mechanical Processes, Physical Stimulation, Somatosensory Cortex/physiology, Time Factors, Touch Perception, Young Adult
Pubmed
Web of science
Open Access
Yes
Create date
15/09/2015 16:36
Last modification date
20/08/2019 13:00
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