title: Environmental influences in the perception of pain.
mesh_terms: D000293:Adolescent; D000328:Adult; D001143:Arousal / Q000187:drug effects; D002648:Child; D005006:Ethnicity / Q000523:psychology; D006801:Humans; D008297:Male; D009020:Morphine / Q000494:pharmacology; D009021:Morphine Dependence / Q000523:psychology; D010146:Pain / Q000523:psychology*; D011930:Reaction Time / Q000187:drug effects; D012684:Sensory Thresholds / Q000187:drug effects; D012718:Set, Psychology; D012931:Social Environment
chemical_list: D009020:Morphine