Fig 2.

Group discounting functions for the three discounting tasks. Data points represent the group median indifference points. For probabilistic gains (top panel), the solid line represents the best-fitting hyperboloid discounting function, where h  =  4.45, s  =  .44, R²  =  .990; the broken line represents the expected value. For probabilistic losses (middle panel), the solid line represents the best-fitting curve for the hyperboloid discounting function, where h  =  2.36, s  =  .55, R²  =  .990; the broken line represents the expected value. For delayed gains (bottom panel), the solid line represents the best-fitting hyperboloid discounting function, where k  =  .00014, s  =  27.20, R²  =  .993.