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  Subarea-specific suppressive interaction in the BOLD responses to simultaneous finger stimulation in human primary somatosensory cortex: Evidence for increasing rostro-to-caudal convergence

Ruben, J., Krause, T., Taskin, B., Blankenburg, F., & Villringer, A. (2006). Subarea-specific suppressive interaction in the BOLD responses to simultaneous finger stimulation in human primary somatosensory cortex: Evidence for increasing rostro-to-caudal convergence. Cerebral Cortex, 16(6), 819-826. doi:10.1093/cercor/bhj025.

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Ruben, J., Author
Krause, Tina, Author
Taskin, B.1, Author              
Blankenburg, F., Author
Villringer, Arno1, Author              
Affiliations:
1External Organizations, ou_persistent22              

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Free keywords: Electrical stimulation; fMRI; SI; somatotopy; suppressice interaction
 Abstract: In the primary somatosensory cortex (SI) of non-human primates, receptive field properties have been shown to differ between its subareas with increasing convergence in areas 1 and 2 as compared with area 3b. In this study, we searched for a similar functional organization of human SI. We performed fMRI in healthy subjects during separate or simultaneous electrical stimulation of the second and third finger of the right hand. Activation patterns in response to stimulation of single fingers reflected the somatotopical arrangement within the hand area of SI. Somatotopy was more clear-cut in area 3b as compared with areas 1 and 2. The response to simultaneous stimulation was considerably smaller than the summed responses to separate stimulation of each finger alone, pointing to a suppressive interaction effect. A region-of-interest analysis in the representational areas of the second and third finger revealed subarea-specific differential suppressive interaction with an increase along the rostral-caudal axis (areas 3b, 1 and 2: 26, 32.7 and 42.2%, respectively). These findings on differences in the topographic as well as functional organization between subareas of SI support the notion of increasing convergence and integration from area 3b to areas 1 and 2 in human subjects.

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Language(s): eng - English
 Dates: 2005-09-142006-06-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: eDoc: 392325
Other: P9008
DOI: 10.1093/cercor/bhj025
 Degree: -

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Title: Cerebral Cortex
Source Genre: Journal
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Publ. Info: New York, NY : Oxford University Press
Pages: - Volume / Issue: 16 (6) Sequence Number: - Start / End Page: 819 - 826 Identifier: ISSN: 1047-3211
CoNE: https://pure.mpg.de/cone/journals/resource/954925592440