Seasonal change in the temporal organization of wheel-running activity of the European hamster, Cricetus cricetus

摘要: In this paper we demonstrate that a dramatic annual change in the temporal organization of locomotor activity goes hand with seasonal cycle reproduction. Activity levels increased when animals entered reproductive conditions, which occurs naturally spring and early summer. During 2-3 months reproduction, well-defined rhythm was observed. rest year, level dramatically reduced almost no rhythmic detected. The question arising from these observations is whether loss reflects weakening or arrhythmia underlying pacemaker it due to an uncoupling overt central clock.