title: A grand research design for the investigation of psychological states.
mesh_terms: D001519:Behavior; D006801:Humans; D001523:Mental Disorders / Q000175:diagnosis* / Q000209:etiology; D008609:Mental Status Schedule; D009042:Motivation; D010556:Personality Tests; D011581:Psychological Tests; D011582:Psychological Theory; D011602:Psychophysiologic Disorders / Q000175:diagnosis; D012107:Research Design; D013812:Therapeutics