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Sex differences in magical ideation: a community-based twin study.

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Women exhibit higher magical ideation (MIS) scores and variability than men. However, genetic factors influencing magical ideation are similar across sexes, indicating no qualitative sex differences in genetic contributions.

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Area of Science:

  • Psychology
  • Behavioral Genetics
  • Cognitive Science

Background:

  • Magical ideation, the tendency to entertain supernatural or paranormal beliefs, is a complex cognitive trait.
  • Previous research has suggested potential sex differences in magical ideation, but these have not been consistently explained by genetic or environmental factors.

Purpose of the Study:

  • To investigate mean-level sex differences in magical ideation (MIS).
  • To examine quantitative and qualitative sex differences in the genetic contributions to variation in MIS scores.

Main Methods:

  • Utilized a large community sample of 4,355 adult Australian twins, including opposite-sex pairs.
  • Administered a modified 15-item version of the Magical Ideation Scale (MIS).
  • Employed biometric modeling to analyze genetic and environmental influences on MIS scores.

Main Results:

  • Women reported significantly higher means and variability on the MIS compared to men.
  • Biometric modeling revealed that the proportion of variation due to genetic influences (quantitative differences) was equivalent in men and women.
  • The specific latent genetic contributions (qualitative differences) to MIS variation were also found to be the same in both sexes.

Conclusions:

  • While women exhibit higher levels and variability in magical ideation, the underlying genetic architecture of this trait is similar between sexes.
  • Findings suggest that observed sex differences in magical ideation are likely attributable to non-genetic factors.
  • This research clarifies the nature of sex differences in magical ideation and highlights the importance of considering both genetic and environmental influences.