TABLE 4.

Studies and experimental characteristics of tES literature for ADHD.

Authors	Subjects	Stimulation parameters				Neuroimaging		Conclusion
		Type	Current	Duration	Location	Type	Feature
Breitling et al., 2020	15	tDCS/HD- tDCS	1 mA/0.5 mA, 20 min	1 session	Anode: right IFG (F8), cathode: contralateral supra-orbital	EEG	N-200 and P300	HD-tDCS could be equally suitable with typical tDCS for improving the working memory processing of patients with ADHD.
Dallmer-Zerbe et al., 2020	18	tACS	1 mA, 20 min, 3 Hz	1 session	Anode: motor-parietal cortex (C3, C4, CP3, Cp4, P3, P4); Cathode: temporal-parietal (T7, T8, TP7, TP8, P7, P8)	EEG	P300	A significant increase in P300 amplitude in the stimulation group, which was accompanied by a decrease in omission errors pre-to-post tACS.
Cosmo et al., 2015b	60	tDCS	1 mA, 20 min	1 session	Anode: left DLPFC (F3), Cathode: right DLPFC (F4).	EEG	Functional cortical network	Anodal tDCS increased the functional brain connectivity in individuals with ADHD compared to data recorded in the baseline resting state.
Cosmo et al., 2015a	60	tDCS	1 mA, 20 min	1 session	Anode: left DLPFC (F3), cathode: right DLPF)^p z(F4).	EEG	Statistical analysis	The statistical analysis indicated that anodal stimulation over the LDPFC could not improve inhibitory control in patients with ADHD.