Table 2.

Descriptive Data for Behavioral Measures and ERP Amplitudes in CTRL and ADHD Groups

		Diagnosis				Medication (n = 22)
		CTRL (n = 28)		ADHD (n = 23)		ADHD Off Medication		ADHD On Medication
		Mean	SD	Mean	SD	Mean	SD	Mean	SD
RT Cap − Floor Differential (msec)	Baseline	328.92	182.05	337.94	171.91	339.34	166.28	280.70	213.96
	Reward	264.18	172.68	237.46	165.45	240.48	159.96	208.54	184.56
	Response Cost	235.17	175.18	244.67	165.72	254.11	169.32	247.75	208.71
Inhibition Rate	Baseline	39.57	15.53	39.08	15.23	39.08	15.23	44.54	18.34
	Reward	46.50	13.14	47.23	15.60	47.23	15.60	51.31	17.05
	Response Cost	44.86	13.08	45.23	13.57	45.23	13.57	47.08	15.83
N2 Go Trials (μV)	Baseline	−9.37	4.15	−7.92	3.83	−7.74	3.74	−9.65	3.56
	Reward	−9.30	4.22	−8.82	3.71	−8.83	3.84	−9.79	3.69
	Response Cost	−9.02	3.96	−8.17	3.49	−7.87	3.36	−9.48	3.88
N2 No-Go Trials (μV)	Baseline	−12.16	4.64	−9.69	4.56	−8.83	3.36	−9.47	3.81
	Reward	−12.47	5.03	−10.25	3.91	−9.57	3.32	−10.47	3.59
	Response Cost	−12.13	4.75	−9.36	4.14	−8.87	3.88	−10.51	3.89
P3 Go Trials (μV)	Baseline	3.56	2.44	2.10	2.73	2.15	2.78	4.15	2.86
	Reward	4.03	2.56	2.24	2.57	2.24	2.63	4.73	2.98
	Response Cost	4.17	2.60	2.53	2.85	2.52	2.92	4.48	2.67
P3 No-Go Trials (μV)	Baseline	6.10	3.49	3.86	3.50	3.89	3.58	6.04	3.66
	Reward	6.37	3.58	4.46	3.95	4.46	4.04	6.74	3.41
	Response Cost	6.14	3.72	4.54	3.70	4.42	3.74	6.09	3.67

Values for inhibition rate must be interpreted in the context of the tracking algorithm employed within the paradigm that minimized between-subject and between-session differences in the ratio of failed to successfully inhibited no-go trials.

ADHD, attention-deficit/hyperactivity disorder; CTRL, control group; ERP, event-related potential; RT, reaction time.