Abstract
Daily feeding time was changed or left the same for four 20-day replications (A, B, B, C) for one female squirrel monkey while quantifying tilt cage activity and number of illumination changes/hour. Periodic regression analysis indicated that a statistically significant circadian cycle (23.5-24.6 h) was present for each replication. In addition, significant Phase by Replication interactions verified that feeding time served as an effective entraining stimulus for the two dependent variables under investigation.
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References
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Enright, J. T. Synchronization and ranges of entrainment in circadian clocks. In J. Aschoff (Ed.), Circadian Clocks. Amsterdam: North-Holland, 1965.
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Cone, A.L. Feeding time entrainment of activity and self-produced illumination change in a squirrel monkey. Bull. Psychon. Soc. 4, 389–391 (1974). https://doi.org/10.3758/BF03336728
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DOI: https://doi.org/10.3758/BF03336728