iEEG_data

This .mat file contains relevant iEEG data for patient S19_137.<br>We used Nihon-Kohden video-EEG monitoring equipment (version WEE-1200 with 1000Hz sampling rate) and Nihon-Kohden Cortical Stimulator (MS-120BK-EEG) and PE-210AK Stimulator Switchbox to deliver electrical pulses at various frequencies, amplitudes and pulse-widths. <br>This data has been preprocessed using the following parameters: A notch filter was applied to attenuate power-line noise (zero-phase, third order butterworth filter with band-stop between 57-63, 117-123, and 177-183 Hz). Channel data were then re-referenced to the common average signal. We performed time-frequency decomposition on the continuous time series with a Morlet wavelet transform for frequencies within the 70-170 Hz range (spaced by increments of 10), also known as the high-frequency broadband (HFB) range. We then normalized the distributions of power amplitude estimates by rescaling each time sample by the log ratio of each whole recording’s time series (i.e., to account for 1/<i>f</i> decline of the power spectrum) and averaged those normalized estimates across all frequencies within the 70-170 Hz range. The HFB power amplitude was then filtered (zero-phase, butterworth, 4th order) between 0.1-1 Hz.<br>This MATLAB structure contains the following fields:1) trialinfo - task info for MMR task which requires patients to press 1 if the math, memory, or fact statement is true and 2 if the statement is false2) time - the length of EEG recording3) fsample - the sampling rate in Hz4) wave - high frequency broadband EEG data5) label - electrode labels6) chan_num - channel number of recorded electrodes7) bad_trials - list of task trials reaching exclusion criteria 8) badChan - list of recorded channels reaching exclusion criteria9) project_name - name of task10) cortex - reconstructed surface of 3D cortex11) volumes - reconstructed volume of 3D cortex12) elinfo - electrode locations and anatomical labels