1. 1. Significant daily rhythms in serotonin (5-HT) concentration occurred in the telencephalon of the rat, hamster, gerbil and guinea pig with a low at 1200 hr in all 4 species and a high either late in the light phase or in the dark phase. 2. 2. Significant daily rhythms of telencephalic norepinephrine (NE) concentrations were found in the rat and gerbil with nadirs in the light phase and zeniths in the dark phase. 3. 3. Daily fluctuations in concentrations of 5-HT and NE were greatest in the gerbil. 4. 4. 5-HT: NE ratio were largest in the gerbil.
|Original language||English (US)|
|Number of pages||4|
|Journal||Comparative Biochemistry and Physiology. Part C, Comparative|
|State||Published - 1977|
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