A genetic and environmental analysis of sensation seeking

The genetic and environmental contributions to the trait of sensation seeking were analyzed using the responses of 422 pairs of twins to the Sensation Seeking Scale (Form IV). The biometrical method of Jinks and Fulker was applied to the data. The data fit the model indicating the likelihood of a predominantly additive gene action controlling the general trait. The heritability figure of 58% (69% of the reliable variance) was quite high for a personality trait. Data from other studies suggest that the heritability of the personality trait rests upon specific inherited biological traits, such as the biochemicals of the brain and gonadal hormones which affect arousability of the central nervous system and relevant traits, such as mood, impulsivity, risk taking, and sociability.