Attention-deficit hyperactivity disorder (ADHD) is the most common developmental disorder that is associated with executive system dysfunction (fronto-striatum-cerebellum circuit abnormalities). Different conventional treatments have been employed on ADHD; however, DC stimulation is a therapeutic tool and possible drug-free option for ADHD. Although transcranial direct current stimulation (tDCS) decreases cortical excitability, the mechanisms underlying DC-induced changes remain largely unclear.

30 children with ADHD took part in the investigation. DC stimulation applied to specific brain areas. 19-chanal EEG was recorded before and after course of tDCS. Psychologiycal Test of Variables of Attention, or TOVA, was carried out before and after course of the treatment.

Results. After course of tDCS we observe widespread dissymmetry changes in EEG ranges. Test TOVA indicates decrease of commission errors (p<.05) and reaction time (p<.05).

Exposure to direct current stimulation can enhance psychological indexes of behavior in ADHD subjects. As such, it deserves consideration as a procedure to improve frontal lobe function in patients. This study shows that quantitative EEG are changed under stimulation. EEG changes are discussed considering a conduction of EEG recording.