The core code is inside Learning_Automation_Judgements.zip. See readme inside the zipped directory.
ChangePointModel.m is Gallistel et al. (2014)'s code supplement to their original paper, on which we based our implementation of their model. Shared with permission from Randy Gallistel.
Gallistel, C. R., Krishan, M., Liu, Y., Miller, R., & Latham, P. E. (2014). The Perception of Probability. Psychological Review, 121, 96-123.