 McKay 2012 offers some criticism of the account by Coltheart and colleagues, and raises the following points among others: (1) it is not a perfectly rational response to adopt the delusional hypothesis as an explanation for the unusual data, unless the probability of the delusional hypothesis before the unusual data is gathered is very high, and this is implausible given the content of some delusional hypotheses (“my wife has been replaced by an almost identical impostor”); (2) factor two as described by Coltheart and colleagues (i.e., a failure to update a belief in the light of conflicting evidence) cannot precede factor one or be acquired at the same time as factor one, because such a form of conservatism would prevent the person from adopting the delusional hypothesis in the first place. McKay’s positive account is that factor two is not a bias towards conservatism (which causes new data conflicting with the delusional hypothesis to be discounted), but a bias towards explanatory adequacy (which causes the delusional hypothesis to be adopted and maintained because it fits the abnormal data so well). McKay also argues that his account is compatible with prediction-error theories of delusion formation: