A new study looks at differences in reported parental affection by twins and differences in their personalities. The results were published in Evolution and Human Behavior. The researchers hypothesized that the twin who reported greater parental affection would also score higher on traits such as plasticity and stability. They also thought that this twin would score higher on the general factor of personality. That refers to traits such as extraversion, agreeableness, conscientiousness and openness to experiences as well as being low on neuroticism. A group of monozygotic twins – identical twins who share a placenta – were included in the study.
A fathers level of affection has great impact
The researchers confirmed their hypothesis, finding that the twin who experienced greater affection scored higher on the general factor of personality. It also showed that differences in perceived level of affection from fathers were more strongly associated with differences in personalities than perceived level of affection from mothers. The researchers also suggested that differential parenting may be heightened in twins because their parents are caring for two children at the same time. Parental stress is a harbinger for differential parenting, and previous studies do confirm that parental stress is higher in parents of twins compared to parents of singletons. The researchers suggested that sibling competition for parental resources may play a larger role with twins.