scholarly journals Transcranial direct current stimulation of the posterior parietal cortex modulates arithmetic learning

2015 ◽  
Vol 42 (1) ◽  
pp. 1667-1674 ◽  
Author(s):  
Roland H. Grabner ◽  
Bruno Rütsche ◽  
Christian C. Ruff ◽  
Tobias U. Hauser
Keyword(s):  
Parietal Cortex ◽  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Posterior Parietal Cortex ◽  
Direct Current Stimulation ◽  
Posterior Parietal ◽  
Stimulation Of

scholarly journals Transcranial direct current stimulation of the posterior parietal cortex biases human hand choice

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kento Hirayama ◽  
Takayuki Koga ◽  
Toru Takahashi ◽  
Rieko Osu
Keyword(s):  
Reaction Time ◽  
Parietal Cortex ◽  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Posterior Parietal Cortex ◽  
Human Hand ◽  
Direct Current Stimulation ◽  
Posterior Parietal ◽  
The Right ◽  
Stimulation Of

AbstractHand choices—deciding which hand to use to reach for targets—represent continuous, daily, unconscious decisions. The posterior parietal cortex (PPC) contralateral to the selected hand is activated during a hand-choice task, and disruption of left PPC activity with a single-pulse transcranial magnetic stimulation prior to the execution of the motion suppresses the choice to use the right hand but not vice versa. These findings imply the involvement of either bilateral or left PPC in hand choice. To determine whether the effects of PPC’s activity are essential and/or symmetrical in hand choice, we increased or decreased PPC excitability in 16 healthy participants using transcranial direct current stimulation (tDCS; 10 min, 2 mA, 5 × 7 cm) and examined its online and residual effects on hand-choice probability and reaction time. After the right PPC was stimulated with an anode and the left PPC with a cathode, the probability of left-hand choice significantly increased and reaction time significantly decreased. However, no significant changes were observed with the stimulation of the right PPC with a cathode and the left PPC with an anode. These findings, thus, reveal the asymmetry of PPC-mediated regulation in hand choice.

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.

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