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  Neural correlates of conscious tactile perception: An analysis of BOLD activation patterns and graph metrics

Grund, M., Forschack, N., Nierhaus, T., & Villringer, A. (2021). Neural correlates of conscious tactile perception: An analysis of BOLD activation patterns and graph metrics. NeuroImage, 224: 117384. doi:10.1016/j.neuroimage.2020.117384.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-1623-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-1624-8
Genre: Journal Article

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 Creators:
Grund, Martin1, Author              
Forschack, Norman1, 2, Author              
Nierhaus, Till1, 3, Author              
Villringer, Arno1, 4, Author              
Affiliations:
1Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634549              
2Department of Experimental Psychology and Methods, University of Leipzig, Germany, ou_persistent22              
3Neurocomputation and Neuroimaging Unit, FU Berlin, Germany, ou_persistent22              
4MindBrainBody Institute, Berlin School of Mind and Brain, Humboldt University Berlin, Germany, ou_persistent22              

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Free keywords: Somatosensory processing; Perceptual awareness; Consciousness; Functional connectivity; Graph theory; fMRI
 Abstract: Theories of human consciousness substantially vary in the proposed spatial extent of brain activity associated with conscious perception as well as in the assumed functional alterations within the involved brain regions. Here, we investigate which local and global changes in brain activity accompany conscious somatosensory perception following electrical finger nerve stimulation, and whether there are whole-brain functional network alterations by means of graph metrics. Thirty-eight healthy participants performed a somatosensory detection task and reported their decision confidence during fMRI. For conscious tactile perception in contrast to undetected near-threshold trials (misses), we observed increased BOLD activity in the precuneus, the intraparietal sulcus, the insula, the nucleus accumbens, the inferior frontal gyrus and the contralateral secondary somatosensory cortex. For misses compared to correct rejections, bilateral secondary somatosensory cortices, supplementary motor cortex and insula showed greater activations. The analysis of whole-brain functional network topology for hits, misses and correct rejections, did not result in any significant differences in modularity, participation, clustering or path length, which was supported by Bayes factor statistics. In conclusion, for conscious somatosensory perception, our results are consistent with an involvement of (probably) domain-general brain areas (precuneus, insula, inferior frontal gyrus) in addition to somatosensory regions; our data do not support the notion of specific changes in graph metrics associated with conscious experience. For the employed somatosensory submodality of fine electrical current stimulation, this speaks for a global broadcasting of sensory content across the brain without substantial reconfiguration of the whole-brain functional network resulting in an integrative conscious experience.

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Language(s): eng - English
 Dates: 2020-09-102020-05-122020-09-122020-09-172021-01-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.neuroimage.2020.117384
Other: online ahead of print
PMID: 32950689
 Degree: -

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Title: NeuroImage
Source Genre: Journal
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Publ. Info: Orlando, FL : Academic Press
Pages: - Volume / Issue: 224 Sequence Number: 117384 Start / End Page: - Identifier: ISSN: 1053-8119
CoNE: https://pure.mpg.de/cone/journals/resource/954922650166