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  Inhibitory impact of subliminal electrical finger stimulation on SI representation and perceptual sensitivity of an adjacent finger

Taskin, B., Holtze, S., Krause, T., & Villringer, A. (2008). Inhibitory impact of subliminal electrical finger stimulation on SI representation and perceptual sensitivity of an adjacent finger. NeuroImage, 39(3), 1307-1313. doi:10.1016/j.neuroimage.2007.09.039.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-BD9D-6 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-1B98-A
Genre: Journal Article

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Taskin, B.1, Author              
Holtze, Susanne1, Author              
Krause, Tina, Author
Villringer, Arno1, Author              
Affiliations:
1External Organizations, ou_persistent22              

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Free keywords: fMRI; Human; Inhibition; Lateral interaction; Psychophysics; Somatosensory cortex
 Abstract: Simultaneous stimulation of two adjacent fingers above sensory perception threshold (supraliminal stimulation) leads to an inhibitory interaction effect on responses in primary somatosensory cortex (SI). Moreover, during electrical finger stimulation closely below threshold for conscious perception (subliminal stimulation) inhibitory interneurons in cortical layer 4 are assumed to be activated preferentially as compared to excitatory interneurons. Using fMRI in humans, here we show that interspersed subliminal electrical stimulation of an adjacent finger reduces the response to target finger stimulation in contralateral SI. This effect was shown in a complementary study to be associated behaviorally with a diminished detectability of test pulses on the target finger. We propose the mechanism underlying this lateral inhibitory effect to be related to a representational overlap of inhibitory interneurons in SI based on the divergence of thalamocortical feedforward projections, or to intracortical lateral inhibitory projections targeting juxtaposed receptive fields, or both.

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 Dates: 2008
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: eDoc: 511895
Other: P8990
DOI: 10.1016/j.neuroimage.2007.09.039
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Title: NeuroImage
Source Genre: Journal
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Publ. Info: Orlando, FL : Academic Press
Pages: - Volume / Issue: 39 (3) Sequence Number: - Start / End Page: 1307 - 1313 Identifier: ISSN: 1053-8119
CoNE: https://pure.mpg.de/cone/journals/resource/954922650166