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Frontoparietal theta-gamma interactions track working memory enhancement with training and tDCS
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Frontoparietal theta-gamma interactions track working memory enhancement with training and tDCS
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Journal Article
Frontoparietal theta-gamma interactions track working memory enhancement with training and tDCS
2020
Overview
Despite considerable interest in enhancing, preserving, and rehabilitating working memory (WM), efforts to elicit sustained behavioral improvements have been met with limited success. Here, we paired WM training with transcranial direct current stimulation (tDCS) to the frontoparietal network over four days. Active tDCS enhanced WM performance by modulating interactions between frontoparietal theta oscillations and gamma activity, as measured by pre- and post-training high-density electroencephalography (EEG). Increased phase-amplitude coupling (PAC) between the prefrontal stimulation site and temporo-parietal gamma activity explained behavioral improvements, and was most effective when gamma occurred near the prefrontal theta peak. These results demonstrate for the first time that tDCS-linked WM training elicits lasting changes in behavior by optimizing the oscillatory substrates of prefrontal control.
•Augmenting WM training with tDCS elicits sustained changes in theta-gamma PAC.•Both the strength and timing of theta-gamma PAC predict individuals’ WM.•TDCS optimizes PAC between PFC and temporo-parietal regions, tracking WM gains.
Publisher
Elsevier Inc,Elsevier Limited,Elsevier
Subject
/ EEG
/ Electrical stimulation of the brain
/ Electroencephalography - methods
/ ESB
/ Executive Function - physiology
/ Humans
/ Memory
/ Memory, Short-Term - physiology
/ Nerve Net - diagnostic imaging
/ Pattern Recognition, Visual - physiology
/ Prefrontal Cortex - physiology
/ Recognition, Psychology - physiology
/ Studies
