<prompt> All of the following are thought disorders, EXCEPT:ParanoiaOCDDelusionVisual Hallucination  <response>: Thought disorders can be of 2 types: a Disorders of thought form or stream e.g. Thought block, formal thought disorder in Schizophrenia, disorganised thinking, derailment in thinking etc b Disorders of thought content e.g. Delusions, obsessions and compulsions etcHallucinations are not thought disorders. They are perceptual abnormalities. Hallucinations can however lead to secondary delusions. 