Classical conditioning in opiate dependence.
D000818:Animals; D003214:Conditioning, Classical; D003463:Cues; D004361:Drug Tolerance; D005108:Extinction, Psychological; D006801:Humans; D009021:Morphine Dependence / Q000523:psychology; D009619:Nociceptors / Q000187:drug effects; D009293:Opioid-Related Disorders / Q000523:psychology*; D012107:Research Design; D013375:Substance Withdrawal Syndrome / Q000523:psychology