There are two files per participant (.lw5 and .mat) from S01 to S18.
These files correspond to preprocessed EEG data (BioSemi 64 channels, BDF files) for each emotion (An = anger, Di = disgust, Fe = fear, Ha = happiness, Sa = sadness).
They can be analyzed using letswave 5 (http://www.nocions.org/letswave5) running on Matlab. 

Preprocessing consisted in:
1. Import in Letswave 5
2. Bandpass (0.1 - 100 Hz) butterworth filter (4th order)
3. Downsampling to 256 Hz
4. Segmentation in 105-secs segments for each stimulation sequence including 1 sec. before the fade-in and 0.5 sec. after the fade-out 
5. Independent Component Analysis removing components corresponding to eye blinks and/or artifacts over frontal and temporal regions
6. Interpolation of artifact-ridden or noisy channels
5. Re-referencing to a common average reference
6. Averaging the four segments (corresponding to the four individual faces used in the study) for each emotion