Table 3.

Correlation slopes between electrophysiological measures and verbal or performance IQ scores in the CTRL and ASD adult groups and between-group comparisons

	Verbal IQ			Performance IQ
	CTRL	ASD	Group difference	CTRL	ASD	Group difference
MMN amplitude (Cz, CPz, Pz)
Neutral	−.03 [−.06; .01] p = .20	.02 [−.05; .08] p = .60	−.05 p = .17	.02 [−.01; .07] p = .39	.04 [.00; .08] p = .14	−.02 p = .63
Emotional	−.01 [−.06; .04] p = .76	−.01 [−.08; .02] p = .62	−.00 p = .91	.04 [−.00; .10] p = .19	.00 [−.02; .04] p = .80	.04 p = .16
MMN latency (Cz)
Neutral	−.20 [−.67; .30] p = .43	.50 [.06; 1.11] p = .09	−.70 p = .04	−.73 [− 1.19; −.19] p < .01	−.18 [−.66; .22] p = .49	−.55 p = .11
Emotional	−.45 [− 1.45; .47] p = .39	−.05 [−.49; .09] p = .88	−.40 p = .40	−1.51 [− 2.24; −.82] p = .01	−.40 [−.89; .04] p = .16	−1.11 p = .01
P3a amplitude (Fz, FCz, Cz)
Neutral	−.02 [−.06; .03] p = .47	.03 [−.04; .08] p = .34	−.05 p = .22	.01 [−.05; .07] p = .75	.03 [−.02; .08] p = .18	−.02 p = .65
Emotional	−.02 [−.08; .05] p = .67	.00 [−.06; .05] p = .94	−.02 p = .58	.06 [−.01; .15] p = .17	.02 [−.03; .07] p = .39	.04 p = .28
P3a latency (FCz)
Neutral	.34 [−.42; 1.18] p = .40	.18 [−.87; .75] p = .62	.16 p = .74	−.97 [− 2.01; −.04] p = .03	−.08 [−.62; 0.60] p = .78	−.89 p = .08
Emotional	−.39 [−.98; .14] p = .19	.11 [−.66; .58] p = .68	−.50 p = .14	.40 [− 1.19; .42] p = .27	.03 [−.36; .43] p = .89	−.43 p = .30

All results displayed in black are non-significant (Bonferroni-corrected p value threshold p = .0063; eight correlations in each group)