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Table 2. 
The Results of Single-Trial GAMM Analysis Based on α Power after the Second Keypress
Parametric CoefficientsEstimateStd. Errort Valuep Value
Intercept 0.0045 0.0080 0.5651 .5720 
  
Smooth TermsedfRef.dfF Valuep Value
s(SOJ) 1.0001 1.0003 12.3827 .0004* 
s(SOJ accuracy) 1.0032 1.0064 0.4280 .5179 
ti(FOJ × SOJ) 1.0016 1.0033 0.2936 .5888 
ti(FOJ × SOJ Accuracy) 2.1676 2.6620 2.2540 .1042 
s(participant) 0.0012 11.0000 0.0000 .9994 
GAMM analysis: R2-locked α power, SOJ cluster, model without FOJ term 
Parametric CoefficientsEstimateStd. Errort Valuep Value
Intercept 0.0045 0.0080 0.5651 .5720 
  
Smooth TermsedfRef.dfF Valuep Value
s(SOJ) 1.0001 1.0003 12.3827 .0004* 
s(SOJ accuracy) 1.0032 1.0064 0.4280 .5179 
ti(FOJ × SOJ) 1.0016 1.0033 0.2936 .5888 
ti(FOJ × SOJ Accuracy) 2.1676 2.6620 2.2540 .1042 
s(participant) 0.0012 11.0000 0.0000 .9994 
GAMM analysis: R2-locked α power, SOJ cluster, model without FOJ term 

The table displays the results of the 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 and the FOJ term has been excluded from the model.

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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