References
- ALBRECHT , P. , VISSCHER , M. B. , BITTNER , J. H. and HALBERG , F. 1956 . Daily changes in 5‐hydroxytryptamine concentration in mouse brain . Proc. Soc. exp. Biol. Med. , 92 : 703 – 706 .
- BRONZOIN , J. D. , MORGANE , P. J. and STERN , W. C. 1972 . EEG synchronization following application of serotonin to area postrema . Amer. J. Physiol. , 223 : 376 – 383 .
- CORDEAU , J. P. , de CHAMPLANI , J. and JACKS , B. 1971 . Excitation and prolonged waking produced by catecholamines injected into the ventricular system of cats . Can. J. Physiol. Pharmacol. , 49 : 627 – 663 .
- CROSSLAND , J. and MERRICK , A. J. 1954 . The effect of anesthesia on the acetylcholine content of brain . J. Physiol. (Lond). , 125 : 56 – 66 .
- DAPRADA , M. and PLETSCHER , A. 1966 . Acceleration of cerebral dopamine turnover by chlorpromazine . Experientia , 22 : 465 – 466 .
- EAKINS , K. E. , COSTA , E. , KATZ , R. L. and REYES , C. L. 1968 . Effect of pentobarbital anesthesia on the turnover of 3H‐noradrenaline in peripheral tissues of cats . Life Sci. , 7 : 71 – 76 .
- ELEFTHERIOU , B. E. 1974 . Circadian rhythm in blood and brain biogenic aimes and other biochemical changes in rabbits . Brain Res. , 75 : 145 – 152 .
- FRIEDMAN , A. H. and WALKER , C. A. 1968 . Circadian rhythms in rat midbrain and caudate nucleus biogenic amine levels . J. Physiol. (Lond). , 197 : 77 – 85 .
- FRIEDMAN , A. H. and WALKER , C. A. 1969 . Rat brain amines, blood histamine and glucose levels in relationship to circadian changes induced by pentobarbitone sodium . J. Physiol. (Lond). , 202 : 133 – 146 .
- GREEN , H. and ERICKSON , R. W. 1967 . Effect of some drugs upon the histamine concentration of guinea pig brain . Arch. Int. Pharmacoldyn. Ther. , 166 : 121 – 126 .
- HALEY , T. J. and McCORMICK , W. G. 1957 . Pharmacological effects produced by intra‐cerebral injections of drugs in the conscious mouse . Brit. J. Pharmacol. , 12 : 12 – 15 .
- HANNIN , I. , MASSARELLI , R. and COSTA , E. 1970 . Acetylcholine concentration in rat brain: diurnal oscillation . Science , 170 : 341 – 342 .
- ILLNEROVA , H. 1971 . Effect of environmental lighting on serotonin rhythm in rat pineal gland during postnatal development . Life Sci. , 10 : 583 – 590 .
- JOUVET , M. 1968 . Insomnia and decrease of cerebral 5‐ hydroxytryptamine after destruction of the raphe system in the cat . Adv. Pharmacol. , 6B : 265 – 279 .
- JOUVET , M. 1969 . Biogenic amines and the states of sleep . Science. , 163 : 32 – 41 .
- LINDBRINK , P. , CORRODI , H. , FUXE , K. and OLSON , L. 1972 . Barbiturates and meprob‐amate: Decreases in catecholamine turnover of central dopamine and noradrenaline neuronal systems and the influence of immobilization stress . Brain Res. , 45 : 507 – 524 .
- MATSUDA , Y. 1968 . Effects of intraventricularly administered adrenaline on rabbits EEG and their modification by adrenergic blocking agents . Jap. J. Pharmacol. , 18 : 139 – 152 .
- MATSUDA , Y. 1969 . Effects of some sympathomimetic amines administered intraventricularly on rabbit's EEG . Jap. J. Pharmacol. , 19 : 102 – 109 .
- MEAD , J. A. R. and FINGER , K. F. 1961 . Asingle extraction method for the determination of both norepinephrine and serotonin in brain . Biochem. Pharmacol. , 6 : 52 – 53 .
- MORGAN , W. W. and YNDO , C. A. 1973 . Daily rhythms in tryptophan andserotonin content in mouse brain: The apparent independence of these parameters from daily changes in food intake and from plasma tryptophan content . Life Sci. , 12 : 395 – 408 .
- NYBACK , H. and SEDVALL , G. 1968 . Effect of chlorpromazine on accumulation and disappearance of catecholamines formed from tyrosine‐C14 in brain . J. Pharmacol, exp. Ther. , 162 : 294 – 301 .
- PERSSON , T. and WALDECK , B. 1971 . A reduced rate of turnover of brain noradrenaline during pentobarbitone anesthesia . J. Pharm. Pharmacol , 23 : 377 – 378 .
- QUAY , W. B. 1965 . Regional and circadian differences in cerebral cortical serotonin concentrations . Life Sci. , 4 : 379 – 384 .
- QUAY , W. B. 1968 . Differences in circadian rhythms in 5‐hydroxytryptamine according to brain region . Amer. J. Physiol. , 215 : 1448 – 1453 .
- REIS , D. J. and WURTMAN , R. J. 1968 . Diurnal changes in brain noradrenalin . Life Sci. , 7 : 91 – 98 .
- REIS , D. J. , CORVELLI , A. and CONNERS , J. 1969 . Circadian and ultradian rhythms of serotonin regionally in cat brain . J. Pharmacol. exp. Ther. , 167 : 318 – 333 .
- ROTH , D. I. , WALTON , P. L. and YAMOMOTO , W. S. 1970 . Area postrema: Abrupt EEG synchronization following close intraarterial perfusion with serotonin . Brain Res. , 23 : 223 – 223 .
- SAITO , Y. 1971 . The circadian rhythm of brain acetylcholine levels and motor activity in the rat . Life Sci. , 16 : 735 – 744 .
- SCHEVING , L. E. , DUNN , J. D. , PAULY , J. E. and HARRISON , W. H. 1972 . Daily variation in 5‐hydroxytryptamine in rat spleen and the effect of stimuli on the rhythm.d . Anat. Rec. , 173 : 257 – 274 .
- SCHEVING , L. E. , DUNN , J. D. , PAULY , J. E. and HARRISON , W. H. 1972 . Circadian variation in rat serum 5‐hydroxytryptamine and effects of stimuli on the rhythm . Amer. J. Physiol , 22 : 252 – 255 .
- Department of Veterinary Physiology and Pharmacology, University of Ibadan, Ibadan (Nigeria).
- School of Pharmacy, Florida Agricultural & Mechanical University, Tallahassee, Florida, U.S.A.