The Influence of Birth Order and Family Size on the Relationships between Cognitive Abilities and Personality Traits

The structure of relationships between cognitive abilities and personality traits is analyzed considering family environment characteristics. The sample was a group of military academy students (N = 404 subjects), the molecular-genetic study was performed by the research fellows of the Department of Behavioral Genetics of the Faculty of Psychology of M.V. Lomonosov Moscow State University. It is shown that the family structure (birth order and a number of children in the family) mediates the relationship between intelligence parameters and personality traits.