Abstract
Finger-ridge count (FRC), an index of prenatal hormone levels, is the number of dermal ridges on the human finger, with majority of individuals having more ridges on their right hand (R>) than their left hand (L>). Although some research show relationships between various cognitive test performances and FRC, the results are not consistent. This study examined the relationship between FRC and performances of three cognitive tests (Eyes test, Theory of Mind task, and Perspective taking task) in a sample of 40 Japanese university students (20 males and 20 females). Results showed a slight relationship (in marginal significance level) between FRC and Perspective taking task, with participants with L> scoring higher than those with R>. Factor scores of the FRC showed a significant main effect for the Eyes task. These results suggest prenatal hormones affect individual differences in social cognition in late adolescence.
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