M. C. Antle

Circadian rhythms in the Syrian hamster can be adjusted by inducing the animal to become active during its usual sleep period. This type of clock resetting is distinct from clock resetting by light, and is thus known as nonphotic phase shifting. Although the prevailing view has …

In the Syrian hamster, the daily rhythm of activity can be reset by activity experimentally induced during the mid-day, which is the usual rest phase in nocturnal rodents. These non-photically induced phase shifts may be mediated, in whole or in part, by serotonergic input to th…