Table 1. Results of statistical analyses of ERP amplitudes in three 50 ms time bins.

	Interaction		Free-choice		Instructed
Time interval (ms)	F1,12	p	t12	p	t12	p
−150 to −50	5.18	0.041	−1.79	0.097	0.58	0.56
−100 to −50	7.75	0.016	−2.57	0.024	0.66	0.515
−50 to 0	2.96	0.110	−0.80	0.437	1.05	0.313

The table shows the interaction term of a 2×2 ANOVA (source of decision x outcome), and results of the follow-up t-tests. All p values are uncorrected. See text for details.