title: Problems in heart rate and alpha electroencephalographic feedback. Is the control over the feedback stimulus meaningful?
mesh_terms: D000513:Alpha Rhythm; D004569:Electroencephalography; D005246:Feedback; D005260:Female; D006323:Heart Arrest; D006339:Heart Rate; D006801:Humans; D008297:Male; D014636:Valsalva Maneuver