 The debate is reviewed by Davies and Egan 2013 who helpfully focus on the distinction between the adoption and the maintenance of the delusional hypothesis and argue that there is no need to postulate an additional reason why we hang on to our delusions (either a bias towards conservatism or empirical adequacy). Once the delusional hypothesis is adopted as an explanation for or an endorsement of the unusual data, it is correct from a Bayesian point of view that it will not be updated or revised due to a conflict with previous beliefs. New evidence would be necessary to prompt an update or a revision. That said, a critical evaluation of the maintenance of the delusional hypothesis can still be made because the delusional belief was formed as prepotent doxastic response to unusual data and thus it is likely to be compartmentalised. As Davies and Egan themselves acknowledge, the application of idealised models of inference such as Bayesianism is somehow limited in the examination of actual belief systems. Even when no pathology is present, biases affecting the adoption and evaluation of hypotheses are going to be the (statistical) norm, which makes it difficult to uniquely identify the problem with the adoption and the persistence of delusional beliefs.