 Most of the authors who deny belief status to delusions have a negative and a positive thesis. The positive thesis is an alternative account of what delusions are. For instance, one might argue that delusions are acts of imagination mistakenly taken by a person to have belief status (Currie and Ravenscroft 2002) or empty speech acts with no intentional import (Berrios 1991). The negative thesis is an account of why delusions are not beliefs. Beliefs have certain characteristics, that is, they are formed and revised on the basis of evidence, they are consistent with other beliefs, they are action guiding in the relevant circumstances. If delusions do not share these characteristics, then they are not beliefs.