RT Journal Article SR Electronic T1 NEUROCHEMICAL CORRELATES OF BEHAVIOR. I. QUANTITATIVE MEASUREMENT OF THE BEHAVIORAL EFFECTS OF THE SEROTONIN PRECURSOR, 5-HYDROXYTRYPTOPHAN JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics SP 100 OP 107 VO 131 IS 1 A1 M. H. Aprison A1 C. B. Ferster YR 1961 UL http://jpet.aspetjournals.org/content/131/1/100.abstract AB Quantitative measurements of the behavioral effects of the serotonin precursor, 5-hydroxy-tryptophan, have been made in pigeons. Intramuscular injections of 25, 50 and 75 mg/kg doses of DL-5-hydroxytryptophan hydrate lowered the bird's rate of responding in proportion to the amount of the conupound injected. Doses below 25 mg/kg had little or no effect.