Intracranial electroencephalography (iEEG) data were obtained from subdural grid electrodes implanted in left hemisphere in patients before resective surgery for intractable epilepsy. Electrodes that had close proximity to the sites of seizure onset, interictal spikes or had >10-dB noise in the 60-Hz band, were considered to be bad channels, and were excluded from the analysis. Also, data from bad trials across all channels were excluded, if the trials included epileptiform activity, or had technical errors. The exclusion of bad electrodes and bad trials were done similar to Conner et al. (2014) and Kadipasaoglu et al. (2014, 2015). Seven patients were analyzed and details of the number of electrodes and the number of trials used for analysis are shown in Table 1, along with patient demographics. iEEG data were preprocessed by first performing a common average reference, where the electrodes within each subject were re-referenced by subtracting the common average of all electrodes (Kadipasaoglu et al., 2017); 60-Hz and higher harmonics were removed using bandstop IIR butterworth filters of order 6. Zero phase filtering was also performed, to ensure that the features in the filtered waveforms were preserved exactly at the same time locations as the unfiltered signals.

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