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  Comparison of fMRI digit representations of the dominant and non-dominant hand in the human primary somatosensory cortex.

Schweisfurt, M. A., Frahm, J., Farina, D., & Schweizer, R. (2018). Comparison of fMRI digit representations of the dominant and non-dominant hand in the human primary somatosensory cortex. Frontiers in Human Neuroscience, 12: 492. doi:10.3389/fnhum.2018.00492.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-B79C-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-B60F-0
Genre: Journal Article

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Schweisfurt, M. A., Author
Frahm, J.1, Author              
Farina, D., Author
Schweizer, R.1, Author              
Affiliations:
1Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society, ou_578634              

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Free keywords: somatotopy; digits; primary somatosensory cortex; fMRI; left; right
 Abstract: The tactile digit representations in the primary somatosensory cortex have so far been mapped for either the left or the right hand. This study localized all ten digit representations in right-handed subjects and compared them within and across the left and right hands to assess potential differences in the functional organization of the digit map between hands and in the structural organization between hemispheres. Functional magnetic resonance imaging of tactile stimulation of each fingertip in BA 3b confirmed the expected lateral-anterior-inferior to medial-posterior-superior succession from thumb to little-finger representation, located in the post-central gyrus opposite to the motor hand knob. While the more functionally related measures, such as the extent and strength of activation as well as the Euclidean distance between neighboring digit representations, showed significant differences between the digits, no side difference was detected: the layout of the functional digit-representation map did not consistently differ between the left, non-dominant, and the right, dominant hand. Comparing the absolute spatial coordinates also revealed a significant difference for the digits, but not between the left and right hand digits. Estimating the individual subject's digit coordinates of one hand by within-subject mirroring of the other-hand digit coordinates across hemispheres yielded a larger estimation error distance than using averaged across-subjects coordinates from within the same hemisphere. However, both methods should only be used with care for single-subject clinical evaluation, as an average estimation error of around 9 mm was observed, being slightly higher than the average distance between neighboring digits.

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Language(s): eng - English
 Dates: 2018-12-10
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.3389/fnhum.2018.00492
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Title: Frontiers in Human Neuroscience
Source Genre: Journal
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Pages: 11 Volume / Issue: 12 Sequence Number: 492 Start / End Page: - Identifier: -