Table 3.

Relationship Between Differential Activation Elicited by Negative vs Neutral Stimuli (ERP_negative − ERP_neutral) and the Barratt Impulsiveness-Version 11 (BIS-11) Total Score for the 4 Groups in the 5 Scalp Regions^a

ERP Component	Scalp-Region	Relationship of ERPnegative − ERPneutral With the BIS-11 Total Score (Spearman ρ)
		HC (N = 28)		NPV (N = 31)		NV (N = 24)		VS (N = 35)
		r	P	r	P	r	P	r	P
N2	Frontal	.29	.12	.33	.07	−.04	.86	−.54	.001**
	Central	.35	.06	.29	.12	.01	.95	−.55	.001**
	Parietal	.43	.02*	.27	.14	.03	.90	−.55	.001**
	Temporal	.27	.17	.31	.09	.05	.80	−.49	.005**
	Occipital	.31	.11	.14	.46	.006	.98	−.57	<.001**
P3	Frontal	.25	.19	.25	.17	−.11	.62	−.40	.02*
	Central	.19	.33	.14	.44	−.08	.70	−.40	.02*
	Parietal	.17	.38	.05	.78	−.16	.46	−.42*	.01*
	Temporal	.13	.53	.26	.16	−.13	.55	−.41	.02*
	Occipital	.06	.75	.09	.62	−.20	.34	−.51	.003**

Note: ^aSpearman correlation coefficients were used because the distribution was not normal. For N2 a negative correlation indicates larger amplitude (greater negativity); for P3 it means reduced positivity.

*P ≤ .05, **P ≤ .01. Values highlighted in bold remain significant after the adaptive Hochberg's procedure for correction for multiple testing.