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+There are two files per participant (.lw5 and .mat) from S01 to S18.
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+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).
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+They can be analyzed using letswave 5 (http://www.nocions.org/letswave5) running on Matlab.
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+
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+Preprocessing consisted in:
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+1. Import in Letswave 5
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+2. Bandpass (0.1 - 100 Hz) butterworth filter (4th order)
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+3. Downsampling to 256 Hz
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+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
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+5. Independent Component Analysis removing components corresponding to eye blinks and/or artifacts over frontal and temporal regions
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+6. Interpolation of artifact-ridden or noisy channels
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+5. Re-referencing to a common average reference
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+6. Averaging the four segments (corresponding to the four individual faces used in the study) for each emotion
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