Event-related TFRs were computed using the Stockwell Transform (ST) in two different ways:- (i) the ST transform was applied to each single-trial, resulting in a complex-valued TFR for each trial. The absolute power for each single-trial TFR was then computed by taking the square of the magnitude of the complex-valued TFR for each trial and these were then averaged across all trials to produce a resultant TFR that was termed the event-related total power TFR or EROTOT TFR. (ii) the ST transform was applied to the trial-averaged ERP waveform, with the absolute power computed by taking the square of the magnitude of the complex-valued TFR, this termed the event-related evoked power TFR or EROEVK TFR. Using these methods, one EROEVK TFR and one EROTOT TFR were produced per electrode site per subject. Based on visual inspection of the distribution of power within the EROEVK and EROTOT TFRs at the MESOI, time-frequency regions of interest (TFROIs) were defined, with the sub-bands of these TFROIs covering the δ, θ and α frequency bands and the time windows covering time epochs that overlapped
