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  Intracranial recordings of unconscious somatosensory processing

Grund, M., Nierhaus, T., Forschack, N., Breuer, E., Ott, D., Holtkamp, M., et al. (2019). Intracranial recordings of unconscious somatosensory processing. Talk presented at 7th MindBrainBody Symposium (MBBS 2019). Berlin, Germany. 2019-03-18 - 2019-03-19.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-27B0-A Version Permalink: http://hdl.handle.net/21.11116/0000-0003-2A89-4
Genre: Talk

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Booklet of the 7th MindBrainBody Symposium 2019

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 Creators:
Grund, Martin1, Author              
Nierhaus, Till1, 2, Author              
Forschack, Norman1, 3, Author              
Breuer, Eva4, Author
Ott, Derek5, Author
Holtkamp, Martin4, Author
Villringer, Arno1, 6, Author              
Affiliations:
1Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, Leipzig, DE, ou_634549              
2Neurocomputation and Neuroimaging Unit, Department of Education and Psychology, Freie Universität Berlin, 14195 Berlin, Germany, ou_persistent22              
3Experimental Psychology and Methods, Faculty of Life Sciences, University of Leipzig, 04109 Leipzig, Germany, ou_persistent22              
4Department of Neurology, Epilepsy-Center Berlin-Brandenburg, Charité – Universitätsmedizin Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Charitéplatz 1, 10117 Berlin, Germany, ou_persistent22              
5Department of Anesthesiology, Intensive Care and Pain Medicine, Unfallklinikum Berlin, 12683 Berlin, Germany, ou_persistent22              
6MindBrainBody Institute, Berlin School of Mind and Brain, Humboldt-Universität zu Berlin, 10099 Berlin, Germany, ou_persistent22              

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Free keywords: somatosensory processing, tactile perception, intracranial EEG, ECoG, alpha rhythm
 Abstract: Introduction: Sensory stimuli that escape conscious perception can still modulate brain function. For imperceptible electrical finger nerve stimulation, we observed an early event-related potential (ERP) in extracranial EEG at 60 ms (but no later ERPs) and increased alpha power over the primary somatosensory cortex (S1; Nierhaus et al., 2015). However, the sensitivity of extracranial EEG might be insufficient for observing later ERPs and the exact localization of multiple alpha rhythm generators. Methods: Here, we recorded electrocorticography (ECoG) data at 2048 Hz from one epilepsy patient while we applied single electrical pulses to her right index finger. The intracranial electrodes were placed over S1 and the secondary somatosensory cortex (S2). The pulse intensities were either imperceptible (subthreshold) or clearly perceptible (suprathreshold) but below the pain threshold. The trials were segmented from 0.5 before to 1.0 s after the stimulus onset and bandpass filtered (1-45 Hz). Results: We observed ERPs both in S1 and S2 together with an alpha desynchronization over the posterior parietal cortex following suprathreshold stimulation. For subthreshold stimulation, we observed next to the early ERP (P60) also a later ERP (N136) in S1, accompanied by an alpha desynchronization over the posterior parietal cortex, as well as a synchronization over the premotor cortex. Discussion: Most likely unconscious somatosensory processing ends in primary somatosensory cortex but not at 60 ms. Furthermore, the modulation of alpha rhythmic activity (synchronization and desynchronization) does not seem to arise in S1. Further research is necessary to investigate which cognitive processes result in the later ERPs (N136) for subliminal stimuli and which mechanisms underlie the alpha effects. However, our results support the proposal that S2 is necessary for conscious tactile perception.

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 Dates: 2019-03-19
 Publication Status: Not specified
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Title: 7th MindBrainBody Symposium (MBBS 2019)
Place of Event: Berlin, Germany
Start-/End Date: 2019-03-18 - 2019-03-19

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