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Abstract
FOLLOWING the demonstration of a release of catecholamines by morphine from the brain stem of cats and dogs1, my interest became focused on the mechanism of this release and the possible role of brain catecholamines in the morphine abstinence syndrome. In many this syndrome is characterized by signs of autonomic activity, for example, tremor, piloerection, lachrymation, salivation, fever, excitement mydriasis2. The same symptoms can be induced experimentally by electrical stimulation of hypothalamic and limbic brain areas of various laboratory animals3 and chemically by interference with the brain-stem content of some biogenic amines4,5.
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