Table 2.

Results of post hoc t-tests for dependent samples (t-values, P-values) for the differences between the four categories of emotional face expression (anger, pain, joy, and neutral) as regards the reaction times (separate for the “grid” and “no grid” conditions), P100 (only for the “grid” condition in LPV subjects), P300 (only for the “grid” condition), early LPC (only for the “grid” condition), and late LPC (only for the “continuous threat” condition); significant findings are marked in bold

	Reaction times		P100	P300	Early LPC	Late LPC
	“Grid” condition	“No grid” condition	“Grid” condition in LPV subjects	“Grid” condition	“Grid” condition	“Continuous threat” condition
Anger vs happy	t=2.83; P=0.006	t=2.69; P=0.008	t=−1.82; P=0.075	t=−0.34; P=0.732	t=−0.26; P=0.797	t=2.83; P=0.007
Anger vs neutral	t=3.33; P=0.001	t=−1.20; P=0.233	t=−3.78; P<0.001	t=−2.76; P=0.007	t=−2.34; P=0.021	t=2.79; P=0.008
Anger vs pain	t=1.44; P=0.153	t=0.03; P=0.973	t=−1.54; P=0.130	t=−2.31; P=0.023	t=−1.83; P=0.069	t=1.41; P=0.167
Happy vs neutral	t=0.36; P=0.721	t=−3.90; P<0.001	t=−2.67; P=0.010	t=−2.44; P=0.016	t=−2.00; P=0.048	t=−0.39; P=0.697
Happy vs pain	t=−1.44; P=0.154	t=−2.36; P=0.020	t=−0.28; P=0.779	t=−1.74; P=0.085	t=−1.57; P=0.120	t=−1.58; P=0.123
Neutral vs pain	t=−1.78; P=0.77	t=1.20; P=0.233	t=2.42; P=0.019	t=0.76; P=0.446	t=0.47; P=0.637	t=−0.95; P=0.349

Notes: Post hoc t-tests for the differences between the categories of emotional face expressions were only computed and subsequently reported in this table if prior analyses of variance revealed a significant effect for the factor “emotion” (for details on the performed analyses of variance see the text).

Abbreviations: LPC, late positive complex; LPV, low pain vigilant.