 The etiological answer to the question why delusions are pathological in (vi) needs to be better explored. So far, the consensus seems to be that reasoning biases affect neurotypical reasoning, and are not present only in people with delusions. Perceptual anomalies can explain the formation of some delusions, but are not always a core factor in the formation of all delusions. A problem with hypothesis evaluation may be at the origin of all delusions, but there is no agreement as to whether the problem is a permanent deficit or a mere performance error. Thus, it is not clear whether etiological considerations can support a categorical distinction between pathological and non-pathological beliefs. The theory that delusions are due to a disruption of prediction-error signals may be able to vindicate this approach, although it is not clear what the link would be between such a disruption and the pathological nature of the beliefs adopted as a result of it.