Part 1 book “Delusions - Understanding the Un-understandable“ has contents: What Is a delusion, when is a delusion not a delusion, delusional disorder, the pathology of normal belief, the psychology of delusions. | i Delusions ii iii Delusions Understanding the Un- understandable Peter McKenna FIDMAG Hermanas Hospitalarias Research Foundation, Barcelona and the CIBERSAM research network, Spain Figures drawn/ redrawn by .