Formal thought disorder that is classical in mania is
In flight of ideas, the individual stas at a point, shifts the topic , subsequent thoughts will have some association but they will not reach goal. This is classical of MANIA In loosening of association, patient comes with random thoughts that is not connected to each other and the goal is not reached. This is classical of schizophrenia they will introduce new words that are not present in one's dictionary , seen in SCHIZOPHRENIA In circumstantial speech individual stas about a topic, adds minute irrelevant details , beats around the bush and finally reaches the goal. This is seen in ORGANIC BRAIN CONDITIONS Ref. Kaplon and sadock, synopsis of psychiatry, 11 th edition, pg No.194
flight of ideas
loosening of assosiation
neologism
circumstantiality
General anatomy