Figure 3.
Observed relationships (bivariate correlations) between variables investigated in this study. Age is related to both a lower D1-R BPND, and lower FA in the connection between vmPFC and NAcc. Both of these variables predict the expected-value signal in vmPFC during choice. This expected-value signal proved important for performance on value-based decision-making. Numbers and CIs on the lines indicate bivariate correlations and their 95% CI. The multiple regression coefficients for these relationships can be found in Tables 2 and 4. Note that in a multiple regression, D1-R BPND in NAcc did not survive as a significant predictor, possibly due to a lack of statistical power in the reduced sample, or as the result of a type 1 error.