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  Imperceptible somatosensory single pulse and pulse train stimulation oppositely modulate mu rhythm activity and perceptual performance

Iliopoulos, F., Taskin, B., Villringer, A., & Nierhaus, T. (2020). Imperceptible somatosensory single pulse and pulse train stimulation oppositely modulate mu rhythm activity and perceptual performance. Cerebral Cortex, 30(12), 6284-6295. doi:10.1093/cercor/bhaa185.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-682A-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-682B-5
Genre: Journal Article

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 Creators:
Iliopoulos, Fivos1, 2, 3, Author              
Taskin, Birol1, 2, Author              
Villringer, Arno1, 2, Author              
Nierhaus, Till1, 4, Author              
Affiliations:
1Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634549              
2MindBrainBody Institute, Berlin School of Mind and Brain, Humboldt University Berlin, Germany, ou_persistent22              
3International Max Planck Research School on the Life Course, Max Planck Institute for Human Development, , ou_persistent22              
4Neurocomputation and Neuroimaging Unit, FU Berlin, Germany, ou_persistent22              

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Free keywords: EEG alpha oscillations; Event-related desynchronization/synchronization; Inhibition; Nonconscious; Subliminal
 Abstract: Subliminal stimulation alters conscious perception - a potential mechanism is the modulation of cortical background rhythms especially in the alpha range. Here, in the human somatosensory domain, we assessed effects of subthreshold (imperceptible) electrical finger nerve stimulation - either presented as single pulses or as brief (1 s) 7 Hz pulse trains-on mu-alpha rhythm and perceptual performance. In electroencephalography, subthreshold single pulses transiently (~150-350 ms poststimulus) increased mu activity (event-related synchronization), while, interestingly, subthreshold trains led to prolonged (>1 s) mu desynchronization. In psychophysics, detection of near-threshold target stimuli was consistently reduced when presented together with subthreshold trains (at three delays), whereas for targets paired with subthreshold single pulses detection remained unaffected (30 and 180 ms) or was even elevated (60 ms). Though both imperceptible, single pulses and pulse trains exerted opposite effects on neural signaling and perception. We suggest that the common neural basis is preferential activation of cortical inhibitory interneurons. While the inhibitory impact of a subthreshold single pulse (reflected by mu synchronization) is not psychophysically detectable-rather perception may be facilitated-repetition of the same subthreshold pulse shifts the excitation-inhibition balance toward an inhibitory cortical state (reflected by perceptual impediment) accompanied by mu desynchronization. These differential findings provide novel insights on the notion of alpha activity mediating functional inhibition.

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Language(s): eng - English
 Dates: 2020-04-272019-12-162020-05-282020-08-082020-12
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1093/cercor/bhaa185
PMID: 32776096
PMC: PMC7609940
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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: 30 (12) Sequence Number: - Start / End Page: 6284 - 6295 Identifier: ISSN: 1047-3211
CoNE: https://pure.mpg.de/cone/journals/resource/954925592440