2017
DOI: 10.7554/elife.22001
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Externally induced frontoparietal synchronization modulates network dynamics and enhances working memory performance

Abstract: Cognitive functions such as working memory (WM) are emergent properties of large-scale network interactions. Synchronisation of oscillatory activity might contribute to WM by enabling the coordination of long-range processes. However, causal evidence for the way oscillatory activity shapes network dynamics and behavior in humans is limited. Here we applied transcranial alternating current stimulation (tACS) to exogenously modulate oscillatory activity in a right frontoparietal network that supports WM. Externa… Show more

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Cited by 177 publications
(249 citation statements)
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“…A relationship between cognitive brain state and stimulation effects is also suggested by the small number of behavioral studies which demonstrate that manipulations of task difficulty can influence the behavioral modulations seen with tDCS (Gill, Shah‐Basak, & Hamilton, ; Jones & Berryhill, ; Li et al, ; Sandrini, Fertonani, Cohen, & Miniussi, ; Wu et al, ). Transcranial alternating current stimulation also shows effects on cortical network activity and connectivity that are dependent on the cognitive brain state (Neuling, Rach, Herrmann, & Schwiedrzik, ; Violante et al, ; Vosskuhl, Huster, & Herrmann, ). The link between the effects of stimulation and brain state has particularly important implications for clinical studies, since tDCS may produce distinct effects depending on whether it is applied during an active task or rest.…”
Section: Discussionmentioning
confidence: 99%
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“…A relationship between cognitive brain state and stimulation effects is also suggested by the small number of behavioral studies which demonstrate that manipulations of task difficulty can influence the behavioral modulations seen with tDCS (Gill, Shah‐Basak, & Hamilton, ; Jones & Berryhill, ; Li et al, ; Sandrini, Fertonani, Cohen, & Miniussi, ; Wu et al, ). Transcranial alternating current stimulation also shows effects on cortical network activity and connectivity that are dependent on the cognitive brain state (Neuling, Rach, Herrmann, & Schwiedrzik, ; Violante et al, ; Vosskuhl, Huster, & Herrmann, ). The link between the effects of stimulation and brain state has particularly important implications for clinical studies, since tDCS may produce distinct effects depending on whether it is applied during an active task or rest.…”
Section: Discussionmentioning
confidence: 99%
“…Heart rate was monitored concurrently in 23 participants using the pulse oximetry of the integrated Siemens Physiological Monitoring Unit. The setup and subsequent signal analysis have been previously described (Violante et al, ). There was no effect of stimulation on mean heart rate or its SD .…”
Section: Methodsmentioning
confidence: 99%
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“…Neurophysiological effects of stimulation have also been explored with fMRI. Violante et al 94 reported that in-phase frontoparietal theta-tACS during a verbal working memory task increased parietal fMRI activity, which correlated with behavioral performance (decreased reaction time for 2-back but not 1-back tasks).…”
Section: Impact Of Theta Stimulation On Working Memorymentioning
confidence: 99%