Transcranial random noise stimulation benefits arithmetic skills

Area of Science:

• Neuroscience
• Cognitive Science
• Psychology

Background:

• Impairments in arithmetic skills are prevalent, leading to significant socio-economic costs.
• The parietal cortex is traditionally linked to numeric processing, but the roles of other brain regions remain under investigation.
• Transcranial random noise stimulation (tRNS) is a non-invasive technique used to modulate cortical activity.

Purpose of the Study:

• To investigate the causal relationship between frontal and parietal cortex stimulation and arithmetic performance.
• To assess both immediate and long-term effects of tRNS on numeric competence.
• To determine if tRNS can enhance working memory function related to arithmetic.

Main Methods:

• Three groups of participants with similar arithmetic skills received tRNS on the frontal lobe, parietal lobe, or a placebo.
• Participants performed a subtraction verification task during stimulation.
• Performance was re-evaluated seven days later, including novel subtractions, to assess long-term effects.

Main Results:

• Both frontal and parietal tRNS significantly reduced reaction times compared to placebo immediately after stimulation.
• Accuracy in arithmetic tasks improved seven days post-stimulation for both frontal and parietal groups.
• The benefits extended to both familiar and unfamiliar subtraction problems.

Conclusions:

• Modulating frontal and parietal cortices via tRNS can enhance basic arithmetic skills.
• The observed improvements suggest a benefit to working memory function.
• tRNS presents a potential neuro-restorative application for improving numeric competence.