 Self deception has been traditionally characterized as driven by motivational factors whereas delusions are now primarily accounted in neuropsychological terms. Although theories of delusion formation involve reference to perceptual and cognitive impairments, as we saw, motivational factors play an important role in the explanation of some delusions, e.g. by partially determining the specific content of the reported delusional state. Thus, one plausible view is that self-deception and delusion are distinct phenomena that may overlap in some circumstances (for further analysis, see Bayne and Fernàndez 2008). There are three arguments for the view that delusions and self-deception overlap.