Hallucinations - a perception which occurs in the absence of an external stimulus
Ideas of reference - innocuous or coindicental events will be ascribed significant meaning by the person
Delusions - a fixed, falsely held belief held with unshakeable conviction
Formal thought disorder - thoughts cannot be directly observed, must be inferred from patterns of speech e.g. clanging and punning, Knight's move thinking, loosening of associations
Thought interference - thought insertion, thought withdrawal, thought broadcasting, thought blocking