scholarly journals Effects of transcranial direct current stimulation over the posterior parietal cortex on episodic memory reconsolidation

Cortex ◽  
2019 ◽  
Vol 121 ◽  
pp. 78-88 ◽  
Author(s):  
Margot Crossman ◽  
Gergely Bartl ◽  
Rebecca Soerum ◽  
Marco Sandrini
Keyword(s):  
Episodic Memory ◽  
Parietal Cortex ◽  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Posterior Parietal Cortex ◽  
Memory Reconsolidation ◽  
Direct Current Stimulation ◽  
Posterior Parietal

Anodal High-definition Transcranial Direct Current Stimulation over the Posterior Parietal Cortex Modulates Approximate Mental Arithmetic

2020 ◽  
Vol 32 (5) ◽  
pp. 862-876
Author(s):  
Matthias Hartmann ◽  
Sarah Singer ◽  
Branislav Savic ◽  
René M. Müri ◽  
Fred W. Mast
Keyword(s):  
Parietal Cortex ◽  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Posterior Parietal Cortex ◽  
Mental Arithmetic ◽  
Cognitive Capacity ◽  
High Definition ◽  
Direct Current Stimulation ◽  
Posterior Parietal ◽  
Left And Right

The representation and processing of numerosity is a crucial cognitive capacity. Converging evidence points to the posterior parietal cortex (PPC) as primary “number” region. However, the exact role of the left and right PPC for different types of numerical and arithmetic tasks remains controversial. In this study, we used high-definition transcranial direct current stimulation (HD-tDCS) to further investigate the causal involvement of the PPC during approximative, nonsymbolic mental arithmetic. Eighteen healthy participants received three sessions of anodal HD-tDCS at 1-week intervals in counterbalanced order: left PPC, right PPC, and sham stimulation. Results showed an improved performance during online parietal HD-tDCS (vs. sham) for subtraction problems. Specifically, the general tendency to underestimate the results of subtraction problems (i.e., the “operational momentum effect”) was reduced during online parietal HD-tDCS. There was no difference between left and right stimulation. This study thus provides new evidence for a causal involvement of the left and right PPC for approximate nonsymbolic arithmetic and advances the promising use of noninvasive brain stimulation in increasing cognitive functions.

scholarly journals Theta-modulated oscillatory transcranial direct current stimulation over posterior parietal cortex improves associative memory

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Katarina Vulić ◽  
Jovana Bjekić ◽  
Dunja Paunović ◽  
Miloš Jovanović ◽  
Slađan Milanović ◽  
...  
Keyword(s):  
Associative Memory ◽  
Parietal Cortex ◽  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Posterior Parietal Cortex ◽  
Cued Recall ◽  
Anodal Tdcs ◽  
Direct Current Stimulation ◽  
Natural Function ◽  
Posterior Parietal

AbstractAssociative memory (AM) reflects the ability to remember and retrieve multiple pieces of information bound together thus enabling complex episodic experiences. Despite growing interest in the use of transcranial direct current stimulation (tDCS) for the modulation of AM, there are inconsistent evidence regarding its benefits. An alternative to standard constant tDCS could be the application of frequency-modulated tDCS protocols, that mimic natural function-relevant brain rhythms. Here, we show the effects of anodal tDCS oscillating in theta rhythm (5 Hz; 1.5 ± 0.1 mA) versus constant anodal tDCS and sham over left posterior parietal cortex on cued recall of face-word associations. In a crossover design, each participant completed AM assessment immediately following 20-min theta-oscillatory, constant, and sham tDCS, as well as 1 and 5 days after. Theta oscillatory tDCS increased initial AM performance in comparison to sham, and so did constant tDCS. On the group level, no differences between oscillatory and constant tDCS were observed, but individual-level analysis revealed that some participants responded to theta-oscillatory but not to constant tDCS, and vice versa, which could be attributed to their different physiological modes of action. This study shows the potential of oscillatory tDCS protocols for memory enhancement to produce strong and reliable memory-modulating effects which deserve to be investigated further.

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