Table 3.

Summary of studies on the effects of tDCS on Attention Deficit/Hyperactivity Disorder (ADHD).

Subjects	tDCS Intervention	Brain Region	Conclusion	Ref.
SHR rats	Anodal; 0.5 mA; 20 min; 8 consecutive days	Pre-frontal cortex	Restore long-term memory deficits, modulate neuroinflammatory molecules, and increase oxidative stress	[61]
Teenagers with a diagnosis of ADHD	Anodal; 1 mA; 20 min; 5 consecutive days	Dorsolateral prefrontal cortex	Reduction of inattention, and a reduction of hyperactivity	[62]
Adult ADHD patients	Anodal; 2 mA; 20 min	Dorsolateral pre-frontal cortex	Improve of performance on a measure of impulsivity	[63]
Teenagers with ADHD	Anodal; 1 mA; 20 min	Dorsolateral pre-frontal cortex	Improve of working memory performance.	[64]
ADHD patients (10–18 years old)	Anodal bifrontal; 1 mA; 20 min combined with cognitive training	Dorsolateral frontal cortex	No significant improvement of ADHD symptoms or cognitive performance	[65]