Alekseichuk, Ivan

[["dc.bibliographiccitation.firstpage","509"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Brain Stimulation"],["dc.bibliographiccitation.lastpage","517"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","de Lara, Gabriel Amador"],["dc.contributor.author","Alekseichuk, Ivan"],["dc.contributor.author","Turi, Zsolt"],["dc.contributor.author","Lehr, Albert"],["dc.contributor.author","Antal, Andrea"],["dc.contributor.author","Paulus, Walter"],["dc.date.accessioned","2018-10-10T10:23:09Z"],["dc.date.available","2018-10-10T10:23:09Z"],["dc.date.issued","2018"],["dc.description.abstract","Phase-amplitude cross-frequency coupling (PAC) is characterized by the modulation of the power of a fast brain oscillation (e.g., gamma) by the phase of a slow rhythm (e.g., theta). PAC in different sub- and neocortical regions is known to underlie effective neural communication and correlates with successful long-term memory formation."],["dc.identifier.doi","10.1016/j.brs.2017.12.007"],["dc.identifier.pmid","29317186"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/15940"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","1876-4754"],["dc.relation.issn","1935-861X"],["dc.title","Perturbation of theta-gamma coupling at the temporal lobe hinders verbal declarative memory"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1513"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","Current Biology"],["dc.bibliographiccitation.lastpage","1521"],["dc.bibliographiccitation.volume","26"],["dc.contributor.author","Alekseichuk, Ivan"],["dc.contributor.author","Turi, Zsolt"],["dc.contributor.author","Amador de Lara, Gabriel"],["dc.contributor.author","Antal, Andrea"],["dc.contributor.author","Paulus, Walter J."],["dc.date.accessioned","2018-11-07T10:12:41Z"],["dc.date.available","2018-11-07T10:12:41Z"],["dc.date.issued","2016"],["dc.description.abstract","Previous, albeit correlative, findings have shown that the neural mechanisms underlying working memory critically require cross-structural and cross-frequency coupling mechanisms between theta and gamma neural oscillations. However, the direct causality between cross-frequency coupling and working memory performance remains to be demonstrated. Here we externally modulated the interaction of theta and gamma rhythms in the prefrontal cortex using novel cross-frequency protocols of transcranial alternating current stimulation to affect spatial working memory performance in humans. Enhancement of working memory performance and increase of global neocortical connectivity were observed when bursts of high gamma oscillations (80-100 Hz) coincided with the peaks of the theta waves, whereas superimposition on the trough of the theta wave and low gamma frequency protocols were ineffective. Thus, our results demonstrate the sensitivity of working memory performance and global neocortical connectivity to the phase and rhythm of the externally driven theta gamma cross-frequency synchronization."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft [SPP 1665]"],["dc.identifier.doi","10.1016/j.cub.2016.04.035"],["dc.identifier.isi","000378661800014"],["dc.identifier.pmid","27238283"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/40288"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.notes.submitter","Najko"],["dc.relation.issn","1879-0445"],["dc.relation.issn","0960-9822"],["dc.title","Spatial Working Memory in Humans Depends on Theta and High Gamma Synchronization in the Prefrontal Cortex"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","147"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Restorative Neurology and Neuroscience"],["dc.bibliographiccitation.lastpage","158"],["dc.bibliographiccitation.volume","35"],["dc.contributor.author","Alekseichuk, Ivan"],["dc.contributor.author","Pabel, Stefanie Corinna"],["dc.contributor.author","Antal, Andrea"],["dc.contributor.author","Paulus, Walter J."],["dc.date.accessioned","2020-12-10T18:44:14Z"],["dc.date.available","2020-12-10T18:44:14Z"],["dc.date.issued","2017"],["dc.description.abstract","Background: There is a growing interest in large-scale connectivity as one of the crucial factors in working memory. Correlative evidence has revealed the anatomical and electrophysiological players in the working memory network, but understanding of the effective role of their connectivity remains elusive. Objective: In this double-blind, placebo-controlled study we aimed to identify the causal role of theta phase connectivity in visual-spatial working memory. Methods: The frontoparietal network was over-or de-synchronized in the anterior-posterior direction by multi-electrode, 6Hz transcranial alternating current stimulation (tACS). Results: A decrease in memory performance and increase in reaction time was caused by frontoparietal intrahemispheric desynchronization. According to the diffusion drift model, this originated in a lower signal-to-noise ratio, known as the drift rate index, in the memory system. The EEG analysis revealed a corresponding decrease in phase connectivity between prefrontal and parietal areas after tACS-driven desynchronization. The over-synchronization did not result in any changes in either the behavioral or electrophysiological levels in healthy participants. Conclusion: Taken together, we demonstrate the feasibility of manipulating multi-site large-scale networks in humans, and the disruptive effect of frontoparietal desynchronization on theta phase connectivity and visual-spatial working memory."],["dc.identifier.doi","10.3233/RNN-160714"],["dc.identifier.eissn","1878-3627"],["dc.identifier.isi","000398131700002"],["dc.identifier.issn","0922-6028"],["dc.identifier.pmid","28059806"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/78377"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Ios Press"],["dc.relation.issn","1878-3627"],["dc.relation.issn","0922-6028"],["dc.title","Intrahemispheric theta rhythm desynchronization impairs working memory"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","474"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Brain Stimulation"],["dc.bibliographiccitation.lastpage","483"],["dc.bibliographiccitation.volume","13"],["dc.contributor.author","Alekseichuk, Ivan"],["dc.contributor.author","Turi, Zsolt"],["dc.contributor.author","Veit, Sibel"],["dc.contributor.author","Paulus, Walter"],["dc.date.accessioned","2020-12-10T14:22:49Z"],["dc.date.available","2020-12-10T14:22:49Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1016/j.brs.2019.12.019"],["dc.identifier.issn","1935-861X"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/71742"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Model-driven neuromodulation of the right posterior region promotes encoding of long-term memories"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","110"],["dc.bibliographiccitation.journal","NeuroImage"],["dc.bibliographiccitation.lastpage","117"],["dc.bibliographiccitation.volume","140"],["dc.contributor.author","Alekseichuk, Ivan"],["dc.contributor.author","Diers, Kersten"],["dc.contributor.author","Paulus, Walter J."],["dc.contributor.author","Antal, Andrea"],["dc.date.accessioned","2018-11-07T10:08:07Z"],["dc.date.available","2018-11-07T10:08:07Z"],["dc.date.issued","2016"],["dc.description.abstract","The aim of this study was to investigate if the blood oxygenation level-dependent (BOLD) changes in the visual cortex can be used as biomarkers reflecting the online and offline effects of transcranial electrical stimulation (tES). Anodal transcranial direct current stimulation (tDCS) and 10 Hz transcranial alternating current stimulation (tACS) were applied for 10 min duration over the occipital cortex of healthy adults during the presentation of different visual stimuli, using a crossover, double-blinded design. Control experiments were also performed, in which sham stimulation as well as another electrode montage were used. Anodal tDCS over the visual cortex induced a small but significant further increase in BOLD response evoked by a visual stimulus; however, no aftereffect was observed. Ten hertz of tACS did not result in an online effect, but in a wide spread offline BOLD decrease over the occipital, temporal, and frontal areas. These findings demonstrate that tES during visual perception affects the neuronal metabolism, which can be detected with functional magnetic resonance imaging (fMRI). (C) 2016 Elsevier Inc. All rights reserved."],["dc.description.sponsorship","DFG [PA 419/15-1]"],["dc.identifier.doi","10.1016/j.neuroimage.2015.11.034"],["dc.identifier.isi","000384071900013"],["dc.identifier.pmid","26608246"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/39408"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Academic Press Inc Elsevier Science"],["dc.relation.issn","1095-9572"],["dc.relation.issn","1053-8119"],["dc.title","Transcranial electrical stimulation of the occipital cortex during visual perception modifies the magnitude of BOLD activity: A combined tES-fMRI approach"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

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[["dc.bibliographiccitation.journal","Journal of the Neurological Sciences"],["dc.bibliographiccitation.volume","357"],["dc.contributor.author","Paulus, Walter J."],["dc.contributor.author","Alekseichuk, Ivan"],["dc.contributor.author","Antal, Andrea"],["dc.date.accessioned","2018-11-07T09:50:10Z"],["dc.date.available","2018-11-07T09:50:10Z"],["dc.date.issued","2015"],["dc.format.extent","E247"],["dc.identifier.doi","10.1016/j.jns.2015.08.862"],["dc.identifier.isi","000384634801192"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/35655"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.publisher.place","Amsterdam"],["dc.relation.conference","22nd World Congress of Neurology (WCN)"],["dc.relation.eventlocation","Santiago, CHILE"],["dc.relation.issn","1878-5883"],["dc.relation.issn","0022-510X"],["dc.title","Tacs in theta range improves the hit rate and general accuracy in a spatial working memory task"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

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