Out of the 133 participants who performed the delay discounting task, 11 had to be excluded. Four individuals were excluded because their k values were negative and the log-transformation could not be performed; seven other individuals were excluded because their data were deemed unsystematic (i.e., the data pattern indicated the action of processes other than reward/delay evaluation). Identification of unsystematic data was performed as described in Johnson and Bickel (2008). In summary, a total of 122 participants were included in the correlation analysis (section 2; see Table 1.B).
