title: Effect of contingent and noncontingent feedback and subject expectancies on electroencephalogram biofeedback training.
mesh_terms: D000513:Alpha Rhythm; D001007:Anxiety / Q000628:therapy; D001290:Attitude; D001307:Auditory Perception; D001676:Biofeedback, Psychology; D004644:Emotions / Q000502:physiology; D006801:Humans