Figure 4.

Direct comparison of the posterior probability per choice trial for the utility and the RSTD models shows that the RSTD model assigns a higher average probability per trial to the choices of 15 out of 16 subjects. The average probability assigned to a choice trial for each subject is the likelihood of the data divided by the number of choice trials. This provides a measure of the choice variance explained by the model (chance, 0.5). The one subject for which the utility model assigned a higher probability per choice is denoted by ×.