Effect of Environmental Lighting on Aggressive and Anxious Behavior in Male Mice

Abstract Koutoku, T., Nakanishi, T., Takagi, T., Yamasaki, I., Zhang, R., Sashihara, K., Saito, E.-S., Saito, S. and Furuse, M. 2003. Effect of environmental lighting on aggressive and anxious behavior in male mice. J. Appl. Anim. Res., 23: 65–74. To study the influence of the different conditions of environmental lightning on aggressive behavior and open field activity, male mice were kept under different conditions of environmental lighting, i.e., A) 12-hour each light and dark (LD), B) continuous light (LL) and C) continuous dark (DD) for 27 days. Although no significant differences were observed among three groups, LL and DD conditions tended to show the inhibitory effect on aggression. In the open field test, the crossing, the time and the path significantly increased with the length of lighting period, but the rearing and defecation were not affected. The amounts of monoamines and their metabolites in the cerebellum, cerebrum and brainstem were hardly affected by lighting conditions. Taken together,...