Author's reply

摘要

Craddock & Owen are certainly right in drawing attention to the 'complex overlap' between psychotic and mood disorders, but the same can be said for most other sets of psychiatric symptoms. The neat, mutually exclusive categories described by our present classifications do not exist in nature, and classifications must necessarily draw a line somewhere between the major groups of symptoms. But are these lines at present drawn in the right places, and are there perhaps too many lines already? Their letter is very welcome, and it is to be hoped that many others will join this debate and express their views on what is an important matter.