title: Biological rhythms in arousal indices: a potential confounding effect in EEG biofeedback.
mesh_terms: D000293:Adolescent; D000328:Adult; D001143:Arousal / Q000502:physiology*; D001676:Biofeedback, Psychology; D004569:Electroencephalography; D005260:Female; D006801:Humans; D008297:Male; D010507:Periodicity