Representative TMS-evoked potentials

Pre-processed single-trial TEPs (electroencephalographic potentials evoked by transcranial magnetic stimulation) recorded in a representative healthy subject during wakefulness.

4 Shared files: TEP_BA6.mat, TEP_BA4.mat, TEP_BA7.mat and TEP_BA19.mat
Suffix indicates the Brodmann's area corresponding to stimulated target.
The following intensities expressed in terms of the maximal stimulator output were applied: 70% for BA6, 47% for BA4, 67% for BA7 and 52% for BA19.

Each file contains the following variables:

Y: TEP data matrix with dimension channels x time x trials
times: time vector with dimension 1 x time samples
srate: sampling rate in Hz
chlocs: structure containing information about the EEG channels' numbers, names, and locations
badch: vector indicating the EEG channels' numbers to be rejected because of bad data quality

Shared data were pre-processed by applying the following standard procedure:
1) high-pass filtering of continuous EEG recordings at 1 Hz;
2) epoching with a time window of [-800 +800] ms around TMS pulses;
3) rejection of artifact-contaminated trials and channels by visual inspection;
4) re-referencing to the average reference;
5) Independent Component Analysis to reduce ocular and muscular artifacts (as in Casarotto et al., Ann Neurol 2016);
6) low-pass filtering at 45 Hz.

Pre-processing summary:
1) channel FT10 was rejected in all sessions;
2) the number of averaged trials out of the total number of recorded trials was
a. 89/100 for BA6;
b. 96/101 for BA4;
c. 102/147 for BA7;
d. 117/130 for BA19.