title: [Endogenous morphine-like substances and their effects on mental function].
mesh_terms: D000818:Animals; D001362:Avoidance Learning / Q000187:drug effects; D004569:Electroencephalography; D004723:Endorphins / Q000502:physiology*; D007858:Learning / Q000187:drug effects; D008568:Memory / Q000187:drug effects; D008606:Mental Processes / Q000502:physiology*; D051381:Rats; D012653:Self Stimulation / Q000187:drug effects
chemical_list: D004723:Endorphins