Table 3.

LMM summary statistics show effects of source credibility, negative and positive headline content and their interactions on ERPs as dependent variables in the social judgment task. Effects on the predefined ROI and time range of the EPN and LPP amplitudes were estimated in separate LMMs and fixed effects were coded as repeated contrasts according to our hypotheses

	EPN				LPP
Coefficient	b (95% CI)	SE	t	P	b (95% CI)	SE	t	P
Intercept (grand mean)	2.41 (1.33 to 3.49)	0.55	4.36	<0.001	4.64 (3.88 to 5.41)	0.39	11.85	<0.001
Source credibility (trusted vs distrusted)	−0.02 (−0.23 to 0.18)	0.11	−0.23	0.819	0.10 (−0.11 to 0.31)	0.11	0.95	0.353
Negative headline content (Neg vs Neu)	−0.29 (−0.50 to −0.08)	0.11	−2.65	0.014	1.13 (0.80 to 1.45)	0.17	6.79	<0.001
Source credibility × negative headline content	0.42 (0.01 to 0.84)	0.21	2.00	0.056	0.36 (−0.06 to 0.78)	0.21	1.69	0.101
Positive headline content (Pos vs. Neu)	−0.11 (−0.32 to 0.09)	0.10	−1.09	0.287	0.50 (0.23 to 0.77)	0.14	3.60	0.001
Source credibility × positive headline content	0.14 (−0.33 to 0.61)	0.24	0.59	0.559	0.21 (−0.29 to 0.71)	0.26	0.83	0.414
Model formula	EPN ∼ headline content × source credibility  +(S + Neg + S × Neg + Pos + S × Pos || subject) + (S + Neg + S × Neg + Pos + S × Pos || face)				LPP ∼ headline content × source credibility  +(S + Neg + S × Neg + Pos + S × Pos || subject) + (S + Neg + Pos + S × Pos || face)

Double bars in random effects terms set correlation parameters to zero. Abbreviations for slopes in the random effects terms: S = source credibility, Neg = negative headline content, Pos = positive headline content. Face stands for face stimulus.