… Personality test data from the California Psychological Inventory were collected on 99 pairs
of identical and 99 pairs Of fraternal adult.male twins… heritability of personality traits as …

… twin study in which a pencil-and-paper personality inventory is administered to pairs of
monozygotic (MZ) and same-sex dizygotic (DZ) twins… correlated across twin pairs within male and …

… model, we decomposed the covariation between N and MD into (a) genetic and environmental
factors that are common to both traits, as well as specific to each one and (b) direct causal …

… Twin studies have demonstrated that personality traits show … twin studies rely on the
assumptions that twins are represen… male twins and singletons and for Alienation between male …

… measure of psychopathic personality traits. Prior behavior … twin method to examine genetic
and environmental influences on variance in FD and IA in a sample of middle-aged male twins…

… for males and … of twin on Factors I and L only and, for the males, on factors O and B only.
The implication of these results is difficult to decide upon because of the small number of male …

… Because this specific cohort includes only male twins born between the years of 1961 –
1964, only male twin pairs were included in this investigation. Although it would be …

… On the basis of previous behavioral genetic studies of antisocial behavior and psychopathic
personality traits, we expected a moderate portion of the variance (20–40%) in each …

… personality traits for each pair of twins. None of the correlations was significant for the identical
twins… For the adult sample, the correlations for the 198 pairs of adult male twins were 0.44 …

… of personality traits from the MPQ—a broadband personality … -order and primary levels of
the trait hierarchy. Based on the … twins born between the years 1972 and 1978 (for males) and …