Annual variation in daily light exposure and circadian change of melatonin and cortisol concentrations at a northern latitude with large seasonal differences in photoperiod length

Seasonal variations in physiology and behavior have frequently been reported. Light is the major zeitgeber for synchronizing internal circadian rhythms with the external solar day. Non-image forming effects of...

Source: Journal of Physiological Anthropology - July 19, 2016 Category: Physiology Authors: Mathias Adamsson, Thorbjörn Laike and Takeshi Morita Source Type: research