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Impulsivity is a complex and multidimensional construct measured using both self-report measures and objective behavioral tasks. However, most studies using behavioral tasks have utilized relatively small homogeneous populations. In this project we examined both self-reported impulsivity, using the Barratt Impulsiveness Scale (BIS), and delay discounting, a behavioral measure of preference for immediate over delayed rewards, in a large sample of adults (N=606). Performance on the self-report and behavioral measures was examined in relation to demographic characteristics including age, sex, race, IQ, years of school and family income. Using hierarchical multiple regression we found that preference for immediate rewards was related to the Nonplanning impulsiveness subscale of the BIS and, after controlling for other variables, also related to intelligence. The finding that delay discounting, or preference for …