Table 1.

Correlations between the trait self-report measures and the averaged difference between the ERP response to unpredicted reward and non-reward trials.

	RPE	EPQ P	EPQ E	EPQ N	SHPS	BAS-DR	BAS-FS	BAS-RR	BIS	BDI	BDI-AN	TEPS-ANT	TEPS-CONS
RPE	1
EPQ P	0.19	1
EPQ E	0.36*	0.06	1
EPQ N	−0.15	0.07	−0.33	1
SHPS	−0.15	0.09	−0.05	0.15	1
BAS-DR	−0.10	0.18	0.25	−0.15	−0.11	1
BAS-FS	0.18	0.48*	0.56**	0.08	−0.03	0.42**	1
BAS-RR	0.22	−0.22	0.22	0.13	−0.31	0.27	0.13	1
BIS	−0.10	−0.39	−0.24	0.53**	0.21	−0.55**	−0.27	0.22	1
BDI	−0.24	0.44*	−0.17	0.67**	0.24	0.07	0.21	−0.21	0.02	1
BDI-AN	−0.08	0.35	0.00	0.55**	0.43**	−0.02	0.23	−0.25	0.04	0.84**	1
TEPS-ANT	0.39*	−0.20	0.38	−0.04	−0.27	0.01	0.05	0.59**	0.19	−0.26	−0.24	1
TEPS-CONS	0.11	−0.18	0.05	−0.06	−0.41*	0.28	0.03	0.33*	−0.06	−0.30	−0.26	0.40*	1
Mean	1.27	5.60	15.96	10.68	0.92	10.71	12.03	16.74	20.71	5.18	1.05	45.37	37.61
SD	2.88	3.21	3.98	5.32	1.51	2.24	1.94	2.10	3.48	5.21	1.38	5.99	4.82

Note: * p < 0.05, ** p < 0.01. RPE = Reward prediction error index, EPQ P = Eysenck Personality Questionnaire—Revised Psychoticism, EPQ E = Eysenck Personality Questionnaire—Revised Extraversion, EPQ N = Eysenck Personality Questionnaire - Revised Neuroticism, SHPS = Snaith-Hamilton Pleasure Scale, BAS-DR = Behavioural Approach System—Drive, BAS-FS = Behavioural Approach System—fun-seeking, BAS-RR = Behavioural Approach System—Reward Responsiveness, BIS = Behavioural Inhibition System, BDI = Beck Depression Inventory, BDI-AN = Beck Depression Inventory Anhedonia, TEPS-ANT = Temporaral Experience of Pleasure Scale—Anticipatory, TEPS-CON = Temporal Experience of Pleasure Scale—Consummatory. n = 25 for all correlations involving the EPQ-R; n = 38 for all other correlations. EPQ-R Extraversion and RPE correlation is reported using one-tailed testing; all other correlations are reported as two-tailed tests.