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Behavioral Inhibition of Circadian Responses to Light
Martin R. Ralph
Department of Psychology
N. Mrosovsky
Department of Psychology, Department of Zoology, and Physiology
Circadian locomotor rhythms in rodents may be synchronized by either photic or nonphotic events that produce phase shifts of the rhythm. Little is known, however, about how these two types of stimuli interact to produce entrainment. The well-characterized circadian photic response of the golden hamster was examined in situations where a short light pulse and locomotor activity, a nonphotic event, occurred simultaneously. Light-induced phase advances were attenuated when animals were active during light exposure. The results show that circadian responses to light depend upon the environmental situation in which the light is given, and call into question the implicit assumption in circadian rhythm research that phase shifting and entrainment to light-dark cycles depend simply on photic activation of well-known retinofugal pathways. Moreover, since light therapy is becoming an important component in the treatment of circadian-based disorders in humans, the results emphasize the need for evaluation of the behavioral aspects of light therapy protocols.
Key Words: phase shift • PRC • activity • behavior • arousal • motivation • nonphotic • hamster
Journal of Biological Rhythms, Vol. 7, No. 4,
353-359 (1992)
DOI: 10.1177/074873049200700408
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