Lability and diversity of circadian rhythms of cotton rats Sigmodon hispidus.

@article{Johnston1983LabilityAD,
  title={Lability and diversity of circadian rhythms of cotton rats Sigmodon hispidus.},
  author={Patrick Gerard Johnston and Irving Zucker},
  journal={The American journal of physiology},
  year={1983},
  volume={244 3},
  pages={R338-46}
}
Cotton rats (Sigmodon hispidus) were maintained from birth in constant LD 14:10 photoperiods and temperatures. Wheel running was diurnal for 6 of 13 juvenile rats and nocturnal for most others. Most diurnal rats eventually added nocturnal activity components. In constant darkness the activity rhythms of adult rats free-ran with a period of 23.2 +/- 0.3 h; in constant illumination the period was 24.7 +/- 0.1 h, in conformation to Aschoff's rule for nocturnal rodents. Some previously nocturnal… CONTINUE READING