The Transylvania effect—the notion that certain patient behavior coincides with moon phases—was carefully tested during a 3-mo. summer period in 1969. Three non-reactive measures were employed and no significant results were found on any of them. It was concluded that a meaningful correlation between the moon phase and acting out behavior of mental patients did not exist and, therefore, did nor explain many unresolved problems in the area.
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Shapiro et al. (1970) studied this question.
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