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|a Index terms: Conditioning processes, classical conditioning, in monkeys, with nalorphine; Conditioning processes, contitioned reinforcers and relapse, in dogs, in man, in monkeys, in rats; Conditioning processes, operant conditioning, in chimpanzees, in dogs, in man, in monkeys, in rats; Enkephalins and endorphins, in analgesia, animals, cats, mice, rats; Enkephalins and endorphins, in mental disorders, catatonia in rats; Receptors, types of, in guinea pig ileum and mouse vas deferens; Relapse, role of conditioned reinforcers, in dogs, in man, in monkeys, in rats; Spinal cord, reflexes, effects of opioids on, in spinal cats; Spinal cord, reflexes, effects of opioids on, in spinal cats, inhibitory processes; Spinal cord, reflexes, effects of opioids on, in spinal cats, inhibitory processes, role of acetylcholine; Spinal cord, reflexes, effects of opioids on, in spinal cats, monosynaptic arcs; Spinal cord, reflexes, effects of opioids on, in spinal cats, polysynaptic arcs; Spinal cord, reflexes, effects of opioids on, in spinal cats, supraspinal inhibitory and facilitatory mechanisms; Spinal cord, reflexes, effects of opioids on, in spinal cats, unit responding in dorsal gray laminae; Spinal cord, reflexes, effects of opioids on, in spinal dogs; Tolerance and physical dependence, phenomena, in chronic decorticated dogs; Tolerance and physical dependence, phenomena, in chronic spinal dogs; Tolerance and physical dependence, phenomena, in rats
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