Results of model comparison.

<p><b>(A)</b> Log-group Bayes factors (smaller is better) relative to the simplest models (Model 1) based on BIC for the nine models tested (<i>left part</i>) and histogram of best-performing models per participant (<i>right part</i>). The models belonged to three families. In the first family, models were based on various combinations of weighting parameters for the first three statistical moments (i.e., EV, Var, and Skw). The second family comprised two rank-dependent utility models in which probabilities were weighted according to non-linear weighting functions (Prelec-I and Prelec-II). In the third family, models were based on the homeostatic principle of minimizing p_starve in addition to combinations of weighting parameters for the statistical moments. Across both frames, the third model family provided the best fit to the data. For ease of reference, the first two models are not depicted because their log-group Bayes factors were far off relative to the other models. The histogram shows that in 11 of 22 participants the best performing model belonged to the third model family. Note that the fixed-effects analyses do not account for possible outliers, while random-effects analyses do. Smaller log-group Bayes factors indicate more evidence for the respective model versus the baseline model. See also <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1004301#pcbi.1004301.t002" target="_blank">Table 2</a>. <b>(B)</b> Parameter estimates from an adaptation of the overall winning model for foraging-p_starve (ξ_foraging) and casino-p_starve (ξ_casino) for individual participants. As expected from the notion that participants should minimize p_starve, most parameter estimates were negative (i.e., in the lower left quadrant). Additionally, for most participants foraging-p_starve was more negative than casino-p_starve (i.e., most points lie below the identity line). See also <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1004301#pcbi.1004301.s003" target="_blank">S1 Fig</a> for binned choice data.