Online anodal tDCS of posterior parietal cortex enhances tactile working memory in time- and performance-dependent manner
A double-blind, sham-controlled study found that anodal transcranial direct current stimulation (tDCS) applied to the left posterior parietal cortex improved tactile working memory performance by approximately 5% in healthy adults. The enhancement emerged gradually about 8 minutes after stimulation onset and was stronger in individuals with lower baseline performance. The findings suggest that brain stimulation effects on cognitive tasks depend on both timing and individual baseline cognitive capacity.
Researchers conducted a controlled study with 32 healthy adults to test whether online anodal tDCS over the left posterior parietal cortex (PPC) could enhance tactile working memory performance. Participants completed two sessions—one with active 2 mA stimulation and one with sham stimulation—while performing a tactile pattern recognition task. Using a sliding-window analysis approach, the team found that active stimulation produced a statistically significant improvement in accuracy relative to sham, with effects emerging approximately 8 minutes into the 15-minute stimulation period and corresponding to roughly a 5% performance gain (Hedges' g = 0.43). Notably, the stimulation effects were baseline-dependent: individuals who started with lower working memory performance showed larger improvements, while those with high baseline performance showed minimal benefits. These results suggest that behavioral effects of parietal tDCS emerge gradually during ongoing stimulation and are modulated by an individual's initial cognitive state.
What's missing
The article does not discuss the practical applications or clinical relevance of these findings for conditions like spatial neglect or cognitive impairment, nor does it address the generalizability of results beyond healthy young adults or the long-term persistence of effects.
How coverage differed
This is a preprint from bioRxiv presenting original research findings in a neutral, methods-focused manner typical of scientific literature. The source presents results objectively without sensationalism or claims beyond what the data supports.
What different sources said
- bioRxivCenter
Time- and performance-dependent enhancement of tactospatial working memory caused by online anodal tDCS of the posterior parietal cortex
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