Page 236 - Like me, or else... - Michelle Achterberg

Chapter 8
gratification performance was mediated by white matter integrity within the fronto-striatal tract at both time points.
Figure 3. Mediation models. The relation between age and delay of gratification skills is partly mediated by FA at timepoint 1 and at timepoint 2. Values are standardized regression coefficients and asterisks indicate significance coefficients (*p<0.05; **p<0.01; ***p<0.001).
Longitudinal prediction
To test whether white matter integrity of the fronto-striatal tract could predict future discounting behavior we performed a linear regression analysis with delay of gratification skills (AUC normalized), age, FA and MD at T1 as predictors for delay of gratification skills at T2. The results showed that in addition to delay of gratification skills at T1 (β=.504, p<.001), FA was a significant predictor (β=.158, p=.034) for delay of gratification skills at T2 (R2 total model=.321, R2 FA =.017),
234