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Effect Of Light On The Circadian Activity Rhythm Of The Slow Loris, Nycticebus Coucang, Jimmy F. Redman Jr.

University of the Pacific Theses and Dissertations

In this study, the locomotor activity of a nocturnal prosimian, the slow loris (Nycticebus coucang), was monitored under an experimentally varied light regime. During the process of reversing their day-night cycle, activity was monitored for a light-dark cycle roughly correlating to the external day-night, a free-running period in total darkness followed by a reversed day- night light regime.

Under constant conditions an endogenous cycle was shown to be present. During the artificial light regimes, locomotor activity became synchronized to the period of darkness.