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Circadian Regulation of Behavior: Differences between Diurnal and Nocturnal Species

Author(s): Gladys S. Martínez

Journal: Universitas Psychologica
ISSN 1657-9267

Volume: 8;
Issue: 2;
Start page: 487;
Date: 2009;
Original page

Keywords: Circadian Rhythms | Diurnal Species | Nocturnal Species | Species Differences

Most organisms, including humans, show daily rhythms of about 24 hoursin physiology, hormonal function, and behavior. In mammals, these rhythmsare controlled by an endogenous circadian pacemaker localized in the suprachiasmaticnucleus (SCN) of the hypothalamus that determines thetemporal organization of several behaviors and physiological processes.Circadian control of daily rhythms differs in diurnal and nocturnal speciesbut many of the mechanisms that may explain these differences remain stillunknown. The aim of this review is to summarize our current knowledgeof the circadian clocks and the differences between diurnal and nocturnalspecies.
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