Abstract # 1981 Poster # 64:

Scheduled for Thursday, August 17, 2006 07:00 PM-09:00 PM: Session 8 (Regency West 1/3 ) Poster Presentation


EFFECTS OF LIGHT INTENSITY ON STEREOTYPIC AND SELF-INJURIOUS BEHAVIOR IN RHESUS MACAQUES

A. M. Dupuy1, S. L. Watson2 and M. B. Fontenot1
1Division of Behavioral Sciences, University of Louisiana at Lafayette-New Iberia Research Center, New Iberia, LA 70560, USA, 2Department of Psychology, University of Southern Mississippi
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     Federal law is vague regarding optimal lighting for primate well-being. The purpose of this study was to examine effects of light intensity on stereotypic and self-injurious behavior in adult male Macaca mulatta. Seventeen monkeys (aged 6-13 years) with a history of stereotypic and self-injurious behavior (SIB) were divided into two groups. The animals in each group were placed in one-tiered single cages in two identical rooms and exposed to three lighting conditions: baseline (563-769 lux), low light (176-201 lux), and bright light (1391-1475 lux). The order of exposure for Group 1 was: baseline (2 weeks), low light (4 weeks), baseline (2 weeks), bright light (4 weeks). The order of exposure was reversed for Group 2. Behavioral data were collected twice weekly using a focal sampling technique. Animals initially housed in bright light (Group 2) had significantly higher rates of hair-plucking (p < 0.05), self-biting (p < 0.05), environmental-directed stereotypy (p < 0.05), and scanning (p < 0.05) when subsequently housed in low light. Animals initially housed in low light (Group 1), displayed higher rates of scanning when subsequently exposed to bright light (p < 0.05). Duration of scanning was higher in the low light condition, regardless of the order of exposure (p < 0.05). These results suggest that animals exposed to bright light conditions may have more difficulty adapting to subsequent low light conditions.