Figure 2.

(A) Power-series regression curves and model fit estimates by group across passive avoidance task (PAT) trials. Adjusted coefficient of determination (R_adj²) and decay-rate coefficient (x^b) derived from each group’s power-series regression model. Brackets contain parametric, 95% confidence limits of x^b. (B) Smoothed frequency distributions (kernel density) of x^b coefficient derived from bootstrapped-resampling procedure for adolescents meeting the criteria for significant cannabis (CUD_High [green]) or alcohol use disorder symptoms (AUD_High [orange]), compared with adolescents not meeting these criteria (AUD-CUD_Low [blue]). Solid vertical lines and associated text reflect parametric x^b derived from each group’s power-series regression. Dashed vertical lines reflect 95th percentile limits of bootstrap distribution. † denotes parametric, 95% confidence interval of x^b did not contain 0. * denotes CUD_High or AUD_High group’s parametric x^b did not surpass the upper bound of the AUD-CUD_Low group’s 95% confidence limit (95% UCL = −.126). ** denotes AUD-CUD_Low group’s parametric x^b did not surpass the lower bound of the CUD_High (95% LCL = −.167) or AUD_High (95% LCL = −.153) 95% confidence limits