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  Imperceptible somatosensory stimulation alters sensorimotor background rhythm and connectivity

Nierhaus, T., Forschack, N., Piper, S. K., Holtze, S., Krause, T., Taskin, B., et al. (2015). Imperceptible somatosensory stimulation alters sensorimotor background rhythm and connectivity. The Journal of Neuroscience, 35(15), 5917-5925. doi:10.1523/JNEUROSCI.3806-14.2015.

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Nierhaus et al_2015_Imperceptible Somatosensory Stimulation Alters Sensorimotor Background Rhythm_The Journal of Neuroscience.pdf (Verlagsversion), 3MB
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Nierhaus et al_2015_Imperceptible Somatosensory Stimulation Alters Sensorimotor Background Rhythm_The Journal of Neuroscience.pdf
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2015
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This work is licensed under a Creative Commons Attribution-Noncommercial 3.0 License.

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 Urheber:
Nierhaus, Till1, 2, 3, Autor           
Forschack, Norman2, 4, Autor           
Piper, Sophie K.1, Autor
Holtze, Susanne1, Autor
Krause, Thomas1, 5, Autor
Taskin, Birol1, 5, Autor
Long, Xiangyu2, Autor           
Stelzer, Johannes6, Autor           
Margulies, Daniel S.3, 7, Autor           
Steinbrink, Jens1, 5, Autor
Villringer, Arno1, 2, 3, 5, Autor           
Affiliations:
1Berlin Neuroimaging Center, Charité University Medicine Berlin, Germany, ou_persistent22              
2Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634549              
3Berlin School of Mind and Brain, Humboldt University Berlin, Germany, ou_persistent22              
4Institute of Psychology, University of Leipzig, Germany, ou_persistent22              
5Center for Stroke Research, Charité University Medicine Berlin, Germany, ou_persistent22              
6Department Neurophysics, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634550              
7 Max Planck Research Group Neuroanatomy and Connectivity, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_1356546              

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Schlagwörter: EEG background rhythms; fMRI; Functional connectivity; Somatosensory evoked potentials; Subthreshold electrical stimulation; Unconscious
 Zusammenfassung: Most sensory input to our body is not consciously perceived. Nevertheless, it may reach the cortex and influence our behavior. In this study, we investigated noninvasive neural signatures of unconscious cortical stimulus processing to understand mechanisms, which (1) prevent low-intensity somatosensory stimuli from getting access to conscious experience and which (2) can explain the associated impediment of conscious perception for additional stimuli. Stimulation of digit 2 in humans far below the detection threshold elicited a cortical evoked potential (P1) at 60 ms, but no further somatosensory evoked potential components. No event-related desynchronization was detected; rather, there was a transient synchronization in the alpha frequency range. Using the same stimulation during fMRI, a reduced centrality of contralateral primary somatosensory cortex (SI) was found, which appeared to be mainly driven by reduced functional connectivity to frontoparietal areas. We conclude that after subthreshold stimulation the (excitatory) feedforward sweep of bottom-up processing terminates in SI preventing access to conscious experience. We speculate that this interruption is due to a predominance of inhibitory processing in SI. The increase in alpha activity and the disconnection of SI from frontoparietal areas are likely correlates of an elevated perception threshold and may thus serve as a gating mechanism for the access to conscious experience.

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Sprache(n): eng - English
 Datum: 2014-09-112015-02-162015-04-15
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1523/JNEUROSCI.3806-14.2015
PMID: 25878264
 Art des Abschluß: -

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Titel: The Journal of Neuroscience
  Andere : J. Neurosci.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Baltimore, MD : The Society
Seiten: - Band / Heft: 35 (15) Artikelnummer: - Start- / Endseite: 5917 - 5925 Identifikator: ISSN: 0270-6474
CoNE: https://pure.mpg.de/cone/journals/resource/954925502187