The quantitative genetics of disgust sensitivity.

Area of Science:

• Behavioral Genetics
• Evolutionary Psychology
• Psychology

Background:

• Individual differences in sensitivity to disgust elicitors are substantial.
• The origins of these variations in disgust sensitivity remain largely unexplored.

Purpose of the Study:

• To quantify the genetic and environmental contributions to individual differences in disgust sensitivity.
• To examine the genetic and environmental influences on the covariation between pathogen, sexual, and moral disgust domains.

Main Methods:

• Utilized a large sample of female twins (N = 1,041) and their siblings (N = 170).
• Employed twin modeling and independent pathways twin models to estimate variance components.
• Analyzed genetic and environmental influences across multiple disgust sensitivity domains.

Main Results:

• Approximately 50% of the variation in pathogen, sexual, and moral disgust sensitivity is attributed to genetic effects.
• Sexual and pathogen disgust sensitivity showed unique genetic influences and a shared genetic factor.
• Moral disgust sensitivity did not demonstrate domain-specific genetic variation.

Conclusions:

• Genetic factors play a significant role in shaping disgust sensitivity across different domains.
• Findings support evolutionary perspectives on the adaptive functions of disgust.
• Disentangling genetic and environmental influences provides insight into the etiology of disgust sensitivity.