Chunk #6 — MATERIALS AND METHODS — EEG recording and processing

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An endophenotype approach to the genetics of alcohol dependence: a genome wide association study of fast beta EEG in families of African ancestry.

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EEG recording and processing has been detailed previously.33 Briefly, resting (eyes closed) EEG was recorded for 4.25 min; a continuous interval of 256 s was analyzed. This study focused on log-transformed absolute fast beta power (20–28 Hz) at occipital bipolar leads (O1–O2; Supplementary Figure S1). EEG procedures were identical at all collection sites.