Errata for Kirby (2013) 

James P. Kirby School of Philosophy, Psychology and Language Sciences University of Edinburgh 
Bayes Optimal ClassifierThe caption for Figure 2(B) is incorrect. This does not show the optimal categorization function ('choose the category with the highest a a posteriori probability') but instead the posterior probability of category c1 (consistent with a frequencytracking decision rule, i.e. 'choose category c1 with probability p(c1)'). A more accurate figure illustrating the decision bound is Figure 2.8 of Kirby (2010). In the simulations reported here, the Bayes optimal decision rule, not the frequencytracking rule, was used (cf. Kirby 2010:512). (Hat tip to Janet Pierrehumbert) 