A. Voxels responding to the interaction between decision entropy and volatility, i.e. voxels that predict decision-related activity more successfully when the environments is stable than volatile, for the Bayesian, QL and WM models. Green rings encircle the SMA and ACC. B. Voxels responding to the three-way interaction of update, category variance, and volatility, in the posterior cingulate cortex and retrosplenial cortex. For A and B, activations are rendered onto a template brain, and the red-white scale indicates the t-value associated with each voxel.