Model uncertainty is strongly associated with changes-of-mind.
(a) Uncertainty as a function of coherence level split by the type of trial (i.e. change-of-mind vs. non-change-of-mind). Change-of-mind trials are associated with higher uncertainty levels compared to non-change-of-mind trials regardless of the coherence level (see Fig 8c, where response times are predicted to be the same for change-of-mind trials regardless of the coherence level). (b) Probability of a change-of-mind as a function of coherence level split by the magnitude of uncertainty level (three tertiles). Changes-of-mind occur only in the highest uncertainty tertile. See Materials and methods for uncertainty level quantification. In both panels, error bars indicate standard error of mean (in panel (a) the error bars overlap with markers).