Table 5. Statistical analysis of the ERP data.

Effect	df	F	P	η2
Condition (Cond)	1, 103	1.72	0.19	0.02
Electrode (Elec)	2, 206	25.98	<0.0001*	0.20
Group	2, 103	3.06	0.05*	0.06
Cond × Group	2, 103	3.62	0.03*	0.07
Elec × Group	4, 206	2.7	0.05*	0.05
Cond × Elec	2, 206	1.04	0.34	0.01
Cond × Group × Elec		<1

ANOVA containing the variables group, condition and electrode. Analysis of the ERPs measured on Fz, Cz and Pz electrodes in the time window of 400–600 ms. Greenhouse-Geisser correction of the P-value was used for inner subject effects (condition and electrode).

^*Significant main effects and interactions.