title: The emotional correlates of smiling and laughter: a preliminary research study.
mesh_terms: D003220:Conflict, Psychological; D003674:Defense Mechanisms; D004644:Emotions; D005149:Facial Expression; D006801:Humans; D007845:Laughter; D009497:Neurotic Disorders / Q000628:therapy; D010554:Personality Disorders / Q000628:therapy; D011575:Psychoanalytic Therapy; D012904:Smiling; D013997:Time Factors