Diagnosis of abnormal thought control: ① Thought speed disorders, such as accelerated (fluttering of ideas) or retarded thought processes. ② Thought form disorders, also known as association disorders, mainly manifesting the looseness of the association structure. Lack of purpose, misuse of symbols, illogical. For example, scattered thinking, pathological symbolic thinking, etc. (iii) Thought control disorder, which means that the patient feels that the thought does not belong to him or her, and the thought activity loses autonomy or feels controlled by external forces. Examples of such experiences are thought deprivation, thought insertion, and thought diffusion. ④Thought content disorders, such as delusions, delusion-like ideas, and obsessive-compulsive ideas. This classification is suitable for clinical diagnostic needs, but is more focused on the study of schizophrenic thought disorders, with less attention to organic encephalopathy or other mental thought disorders.