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Updated: Aug 19, 2026

Windowing Chicken Eggs for Developmental Studies
Published on: October 1, 2007
Critical comment on Hicks-Caskey and Potter, "Effect of the full moon on a sample of developmentally delayed,
1Department of Educational Psychology, College of Education, University of Saskatchewan, Saskatoon, Canada.
Abstract:
Hicks-Caskey and Potter (1991) claim to have found a "full moon effect" on women in a developmental center. Further, they suggest the discrepancies in findings on lunar effects can be accounted for by (i) a lack of equivalent operational definitions and (ii) a person selection factor. It is argued that the Hicks-Caskey and Potter findings are undermined by weekday, holiday, season, weather, particular staff-subject interactions, and expectancy effects. In addition, the proposed explanations for differing outcomes in lunar studies do not explain both the negative findings and conflicting positive findings.
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