The effect of bipolar bihemispheric tDCS on executive function and working memory abilities

Area of Science:

• Neuroscience
• Cognitive Science

Background:

• Cognitive functioning is crucial for daily life. Transcranial electric stimulation (tES), particularly transcranial direct current stimulation (tDCS), is explored for cognitive enhancement.
• Previous research on tDCS for cognitive function, especially over the dorsolateral pre-frontal cortex (DLPFC), has yielded mixed results.

Purpose of the Study:

• To investigate the effects of anodal and cathodal bipolar bihemispheric tDCS on executive function and working memory.
• To explore potential sex-based differences in response to tDCS for cognitive enhancement.

Main Methods:

• 72 healthy young adults were divided into control, sham, anodal stimulation, and cathodal stimulation groups.
• Participants completed cognitive tests (Stroop & N Back) pre- and post-30-minute stimulation/sham/control protocol.

Main Results:

• Overall, tDCS efficacy for cognitive enhancement was less evident compared to motor learning.
• Males showed benefits in attention tasks (Stroop) with both anodal and cathodal tDCS.

Conclusions:

• tDCS may not be universally effective for enhancing cognitive functions.
• Sex appears to be a potential moderating factor in the efficacy of tDCS for cognitive functioning, warranting further research.