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Comparison of delay discounting of small, medium, and large hypothetical monetary rewards in FH+ and FH− individuals, as indexed by natural log transformed k values (mean ± SEM). FH+ participants discounted delayed rewards more impulsively, as indexed by higher k values. FH+ = subjects with a positive parental history of alcohol or drug abuse. FH− = persons with no alcohol or drug abuse in parents or grandparents.
