Figure 4. Model predictions for the intertemporal choice task.

(A) Quasi-hyperbolic model predictions for the intertemporal choice task. Points and error bars represent the mean ± standard error of individual rat behavior; lines and ribbon represent mean ± standard error of model predicted behavior for each individual rat. (B) The iBIC score for each model for the delay discounting experiment. Util-pwr and util-crra = nonlinear reward utility with power and CRRA function respectively, pre-del = linear overestimation of pre-reward delays, post-del = linear underestimation of post-reward delays, post-del-pwr=underestimation of post-reward delays according to a power function, disc-exp = exponential discounting, disc-hyp = hyperbolic discounting, disc-cs = constant sensitivity discounting, disc-quasi = quasi hyperbolic discounting.

Figure 4—figure supplement 1. State space diagram of the intertemporal choice task.

Decisions made in Decision states cause transition to the Delay, Reward, and ITI states for the option chosen (either SS or LL), then back to the next Decision state. The model consisted of 10 consecutive trials — the number of free choice trials — plus the value of rewards in future games.

Figure 4—figure supplement 2. Comparison of all-future horizon and one-trial horizon discounting models.

(A) iBIC for the full horizon and one-trial horizon discounting models (B) Measured log-transformed discount factors for the full horizon and one-trial horizon discounting models. Bars and errorbars represent mean ± standard error.