| 2D:4D of the finger is one index of the individual difference. 2D:4D correlates with various traits linked to sex hormones. A low value of 2D:4D indicates high in testosterone and low in estrogen and is characteristic of males. A high 2D:4D suggests low prenatal testosterone and high estrogen and is characteristic of females. Several studies report significant correlations between 2D:4D and such diverse traits as cognitive abilities and aggressiveness. However, there was no study about relationship between 2D:4D and various traits in driving. This study hypothesized that testosterone contributes human aggressive behavior and navigation ability during driving, and that 2D:4D will correlate with aggressive trait and cognitive performance. First study used questionnaire to measure aggressiveness scores from subjects. Second study used driving simulator with map which need to use mental rotation to measure navigation ability. For both study, 2D and 4D for right hand were measured. Men with low 2D:4D showed high aggressive driving score from the questionnaire. Men with high 2D:4D were record poor performance on navigation task. These results are consistent with the hypothesis that testosterone has an organization effect on aggressive behavior and navigtion ability in man. This study found no correlation between finger length ratio and any form of aggressive behavior or navigation ability in females. |
