Structural equation model (SEM) of the association among latent externalizing psychopathology (EXT) factor, executive working memory capacity (EWM-C), and delay discounting rate parameter, log10(k). Path weight in inside parentheses indicate the indirect effect of EXT on log10(k), which reflects the amount of the association between EWM-C and log10(k) that is shared with EXT. All path weights are significant at p < .001, with the exception that p < .01 for those with **. CCD = lifetime childhood conduct problems; ASP = lifetime antisocial behavior problems; MJ = lifetime problems with marijuana; DRG = lifetime problems with other drugs; ALC = lifetime alcohol problems; ACT = Auditory Consonant Trigram performance; OWS = Operation Word Span performance