Heritability of dimensions of Eysenck's pen model and the alternative five-factor model of personality

The main aim of this study is to estimate the heritability of AFFM and PEN dimensions, including 67 pairs of twins (34 monozygotic and 33 dizygotic) of both genders, aged 18 - 44. The heritability has been estimated by the biometric method, two full (ACE and ADE) and three reduced (AE, DE and CE) models tested for each personality trait. Taking into consideration the AFFM dimensions, additive genetic factors and a non-shared environment contribute the most significantly to the phenotypic variation of activity, sociability and the impulsive sensation seeking; anxiety and aggressiveness are best accounted for by the dominant genetic effects. In the PEN domain, fit indicators suggest that ACE and the reduced AE models provide the best explanation for the phenotypic manifestations of neuroticism, while ACE and CE models account for the variation of L scale. Although the fit indicators calculated for extraversion and psychotic behavior are somewhat problematic, the parameter estimates show that extraversion is best accounted for by the additive genetic variance, shared environmental effects, and the non-shared environment, whereas psychotic behavior is the most adequately explained by both shared and non-shared environmental effects. Osnovni cilj istrazivanja bio je ispitivanje naslednih i sredinskih cinilaca dimenzija APM i PEN modela. Istrazivanje je obuhvatilo 67 parova blizanaca oba pola, 34 para monozigotnih i 33 para dizigotnih, starosti 18 - 44 godine. Naslednost osobina licnosti iz pomenutih modela ispitivana je biometrijskim metodom, pri cemu su za svaku osobinu testirana dva puna (ACE i ADE) i tri redukovana (AE, DE i CE) modela nasledjivanja. U prostoru APM, najznacajniji doprinos varijansi dimenzija aktivitet, socijabilnost i impulsivno trazenje senzacija imaju aditivni genetski cinioci i nedeljena sredina; za dimenzije anksioznost i agresivnost dominantni genetski efekti imaju vazniju ulogu od aditivnih. U prostoru dimenzija PEN modela, indikatori fita idu u prilog adekvatnosti ACE i redukovanog AE modela za dimenziju neuroticizam, a ACE i redukovanog CE modela za L skalu. Indikatori fita su se pokazali problematicnim za dimenzije ekstraverzija i psihoticizam, ali procena parametara heritabilnosti sugerise da je ekstraverzija najbolje objasnjena efektima aditivne genetske varijanse, deljene sredine i nedeljene sredine, a psihoticizam efektima deljene i nedeljene sredine.