"Endogenous morphine", opioid like body-own material (group of more than 30 neuropeptides), which were proven for the first time 1975 to drive-adjusting areas of the brain in feeling.
Heart and J. Dum (1987) at Max-Planck-Institute for psychiatry, Munich, determined an absorption of the pain feeling, but also influences on the respiration, the blood pressure, the intestine activity and heat regularization with the experimental administration of endorphins not only. Particularly the beta-endorphin system in the brain seems to play a role with euphoric conditions, e.g. with the welfare-chamfered or in vital border experiences. Likewise an increase of the endorphin connections with the assignment of antidepressives (so-called "opiate receptors") in the brain became determined.