Table A1.

EEG Results of the 50 ms analysis. Paired-sample t-tests were performed between inner and overt speech, separately for the preparation and execution phase between 100–600 ms in 50 ms consecutive steps; numbers indicate significant p-values; ns indicates non-significant.

Preparation
ms	100–150	150–200	200–250	250–300	300–350	350–400	400–450	450–500	500–550	550–600
Electrodes
F3	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
F5	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
FC3	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
FC5	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
TF7	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
C3	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
C5	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
T7	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
CP3	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
CPP5H	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
P3	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
P5	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
P7	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
F4	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
F6	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
FC4	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
FC6	ns	ns	ns	ns	0.039	ns	ns	ns	ns	ns
FT8	ns	ns	ns	0.006	0.001	0.006	0.006	0.011	0.050	0.034
C4	ns	ns	ns	ns	0.018	ns	ns	ns	ns	ns
C6	ns	ns	ns	0.014	0.020	ns	ns	ns	ns	ns
T8	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
CP4	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
CPP6H	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
P4	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
P6	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
P8	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
Fz	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
Cz	ns	ns	ns	0.010	0.002	ns	ns	ns	ns	ns
Pz	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
Execution
ms	100–150	150–200	200–250	250–300	300–350	350–400	400–450	450–500	500–550	550–600
Electrodes
F3	ns	ns	ns	0.098	ns	ns	ns	ns	ns	ns
F5	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
FC3	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
FC5	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
TF7	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
C3	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
C5	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
T7	ns	ns	ns	0.036	ns	ns	ns	ns	ns	ns
CP3	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
CPP5H	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
P3	ns	ns	ns	ns	ns	ns	ns	0.038	ns	ns
P5	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
P7	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
F4	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
F6	ns	ns	0.014	0.001	ns	ns	ns	ns	ns	ns
FC4	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
FC6	ns	ns	0.034	0.007	ns	ns	ns	ns	ns	ns
FT8	ns	ns	0.019	0.035	ns	ns	ns	ns	ns	ns
C4	ns	ns	0.007	0.010	ns	ns	ns	ns	ns	ns
C6	ns	0.029	0.001	0.001	ns	ns	ns	ns	ns	ns
T8	ns	ns	0.036	ns	ns	ns	ns	ns	ns	ns
CP4	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
CPP6H	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
P4	ns	ns	ns	ns	ns	ns	ns	0.029	0.035	ns
P6	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
P8	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
Fz	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns
Cz	ns	ns	ns	ns	ns	ns	ns	0.022	0.012	0.021
Pz	ns	ns	ns	ns	ns	ns	ns	ns	ns	ns