Selective modulation of interhemispheric functional connectivity by HD-tACS shapes perception

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Selective modulation of interhemispheric functional connectivity by HD-tACS shapes perception. / Helfrich, Randolph F; Knepper, Hannah; Nolte, Guido; Strüber, Daniel; Rach, Stefan; Herrmann, Christoph S; Schneider, Till R; Engel, Andreas K.

In: PLOS BIOL, Vol. 12, No. 12, 01.12.2014, p. e1002031.

Research output: SCORING: Contribution to journalSCORING: Journal articleResearchpeer-review

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Helfrich RF, Knepper H, Nolte G, Strüber D, Rach S, Herrmann CS et al. Selective modulation of interhemispheric functional connectivity by HD-tACS shapes perception. PLOS BIOL. 2014 Dec 1;12(12):e1002031. https://doi.org/10.1371/journal.pbio.1002031

Bibtex

@article{35880dc08f294924882f27d46f70a818,
title = "Selective modulation of interhemispheric functional connectivity by HD-tACS shapes perception",
abstract = "Oscillatory neuronal synchronization between cortical areas has been suggested to constitute a flexible mechanism to coordinate information flow in the human cerebral cortex. However, it remains unclear whether synchronized neuronal activity merely represents an epiphenomenon or whether it is causally involved in the selective gating of information. Here, we combined bilateral high-density transcranial alternating current stimulation (HD-tACS) at 40 Hz with simultaneous electroencephalographic (EEG) recordings to study immediate electrophysiological effects during the selective entrainment of oscillatory gamma-band signatures. We found that interhemispheric functional connectivity was modulated in a predictable, phase-specific way: In-phase stimulation enhanced synchronization, anti-phase stimulation impaired functional coupling. Perceptual correlates of these connectivity changes were found in an ambiguous motion task, which strongly support the functional relevance of long-range neuronal coupling. Additionally, our results revealed a decrease in oscillatory alpha power in response to the entrainment of gamma band signatures. This finding provides causal evidence for the antagonistic role of alpha and gamma oscillations in the parieto-occipital cortex and confirms that the observed gamma band modulations were physiological in nature. Our results demonstrate that synchronized cortical network activity across several spatiotemporal scales is essential for conscious perception and cognition.",
author = "Helfrich, {Randolph F} and Hannah Knepper and Guido Nolte and Daniel Str{\"u}ber and Stefan Rach and Herrmann, {Christoph S} and Schneider, {Till R} and Engel, {Andreas K}",
year = "2014",
month = dec,
day = "1",
doi = "10.1371/journal.pbio.1002031",
language = "English",
volume = "12",
pages = "e1002031",
journal = "PLOS BIOL",
issn = "1544-9173",
publisher = "Public Library of Science",
number = "12",

}

RIS

TY - JOUR

T1 - Selective modulation of interhemispheric functional connectivity by HD-tACS shapes perception

AU - Helfrich, Randolph F

AU - Knepper, Hannah

AU - Nolte, Guido

AU - Strüber, Daniel

AU - Rach, Stefan

AU - Herrmann, Christoph S

AU - Schneider, Till R

AU - Engel, Andreas K

PY - 2014/12/1

Y1 - 2014/12/1

N2 - Oscillatory neuronal synchronization between cortical areas has been suggested to constitute a flexible mechanism to coordinate information flow in the human cerebral cortex. However, it remains unclear whether synchronized neuronal activity merely represents an epiphenomenon or whether it is causally involved in the selective gating of information. Here, we combined bilateral high-density transcranial alternating current stimulation (HD-tACS) at 40 Hz with simultaneous electroencephalographic (EEG) recordings to study immediate electrophysiological effects during the selective entrainment of oscillatory gamma-band signatures. We found that interhemispheric functional connectivity was modulated in a predictable, phase-specific way: In-phase stimulation enhanced synchronization, anti-phase stimulation impaired functional coupling. Perceptual correlates of these connectivity changes were found in an ambiguous motion task, which strongly support the functional relevance of long-range neuronal coupling. Additionally, our results revealed a decrease in oscillatory alpha power in response to the entrainment of gamma band signatures. This finding provides causal evidence for the antagonistic role of alpha and gamma oscillations in the parieto-occipital cortex and confirms that the observed gamma band modulations were physiological in nature. Our results demonstrate that synchronized cortical network activity across several spatiotemporal scales is essential for conscious perception and cognition.

AB - Oscillatory neuronal synchronization between cortical areas has been suggested to constitute a flexible mechanism to coordinate information flow in the human cerebral cortex. However, it remains unclear whether synchronized neuronal activity merely represents an epiphenomenon or whether it is causally involved in the selective gating of information. Here, we combined bilateral high-density transcranial alternating current stimulation (HD-tACS) at 40 Hz with simultaneous electroencephalographic (EEG) recordings to study immediate electrophysiological effects during the selective entrainment of oscillatory gamma-band signatures. We found that interhemispheric functional connectivity was modulated in a predictable, phase-specific way: In-phase stimulation enhanced synchronization, anti-phase stimulation impaired functional coupling. Perceptual correlates of these connectivity changes were found in an ambiguous motion task, which strongly support the functional relevance of long-range neuronal coupling. Additionally, our results revealed a decrease in oscillatory alpha power in response to the entrainment of gamma band signatures. This finding provides causal evidence for the antagonistic role of alpha and gamma oscillations in the parieto-occipital cortex and confirms that the observed gamma band modulations were physiological in nature. Our results demonstrate that synchronized cortical network activity across several spatiotemporal scales is essential for conscious perception and cognition.

U2 - 10.1371/journal.pbio.1002031

DO - 10.1371/journal.pbio.1002031

M3 - SCORING: Journal article

C2 - 25549264

VL - 12

SP - e1002031

JO - PLOS BIOL

JF - PLOS BIOL

SN - 1544-9173

IS - 12

ER -