Table 5. 
The Results of Single-Trial GAMM Analysis Based on Sustained Activity Preceding the Second Keypress
Parametric CoefficientsEstimateStd. Errort Valuep Value
(Intercept) −0.0040 0.0074 −0.5389 .5900 
  
Smooth TermsedfRef.dfF valuep Value
s(FOJ) 1.0000 1.0001 0.1091 .7412 
s(SOJ) 1.0000 1.0001 27.6527 <.0001* 
s(SOJ accuracy) 1.0000 1.0001 4.4611 .0347 
ti(SOJ × FOJ) 2.0365 2.5519 1.3882 .2115 
ti(FOJ × SOJ Accuracy) 1.0077 1.0153 1.0731 .2974 
s(participant) 0.0003 11.0000 0.0000 .9815 
GAMM analysis: R2-locked readiness potential, posterior cluster 
Parametric CoefficientsEstimateStd. Errort Valuep Value
(Intercept) −0.0040 0.0074 −0.5389 .5900 
  
Smooth TermsedfRef.dfF valuep Value
s(FOJ) 1.0000 1.0001 0.1091 .7412 
s(SOJ) 1.0000 1.0001 27.6527 <.0001* 
s(SOJ accuracy) 1.0000 1.0001 4.4611 .0347 
ti(SOJ × FOJ) 2.0365 2.5519 1.3882 .2115 
ti(FOJ × SOJ Accuracy) 1.0077 1.0153 1.0731 .2974 
s(participant) 0.0003 11.0000 0.0000 .9815 
GAMM analysis: R2-locked readiness potential, posterior cluster 

The table displays the results for the final model that was based on the data collapsed across the significant sensors, showing the main effect of SOJ, when the model was fitted on a per-sensor basis. The table depicts the posterior cluster.

The asterisk signifies the factors that were significant after false discovery rate correction, applied after the same model was fitted for every sensor separately.

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