Mental activity is a reflection of the objective world transplanted in the human mind. There is no difference between right and wrong in the objective world. Correctness and error occur in the process of reflection of the subjective world. And there are two different kinds of wrong reflections, one is the wrong reflection of a sound brain, a sound reflective organ. Such as wrong thinking, prejudice and superstition about certain things, religious superstition, etc. The other is a large number of pathological distorted reflections arising from the unsound brain and the reflective organs themselves, which are the psychiatric symptoms. There is a fundamental difference between the wrong reflection of a normal person and the pathological mental symptoms. To identify the wrong reflection of normal people and pathological mental symptoms, there are roughly the following aspects: 1. Whether it is specific or not: normal people often have some wrong judgments or ideas, but these wrong judgments or ideas are very common and have no special significance, so they are not considered pathological reflections. In contrast, the mental symptoms caused by unsound brain and unsound reflective organs are a very special kind of wrong reflection, even without any basis and lacking the minimum law of logical reasoning. For example, if a patient sees a young girl on the roadside and closes the door behind him, he feels that the young girl is in love with him and is convinced of this. This kind of wrong judgment is called pathological delusion, and in psychiatric terminology it is called delusion of being in love. 2. Absurdity: Normal people may have some wrong thoughts and prejudiced ideas in social life due to the influence of the opposite side of life and worldview, but these wrong reflections often have certain objective reasons and realistic basis, and can generally be understood by people, and not out of thin air. For example, if a person has a bad relationship with his neighbor and often gets into arguments or even fights, he may be wary of the neighbor in his daily life and may suspect that the neighbor will take revenge on him in some way, or even think that some of the neighbor’s words are intended to attack him by insinuation. Pathological psychiatric symptoms, on the other hand, are mostly absurd and unfounded, with no objective cause or basis. For example, I once saw a patient who was nervous and scared when he was working abroad, believing that he had offended a triad “boss” who was using a high-tech machine to track and monitor him all the time, and that after he was caught, a chip was installed in his brain to control him. After catching him, he installed a chip in his brain to control himself. Therefore, he often calls 911 to ask the police to protect him. This is a typical absurd and unfounded delusion, which is called a victimization delusion in psychiatric terminology. 3. Whether it can be corrected with facts: As the saying goes, people are not saints, who can’t be faulted? It is not terrible to have a wrong thought. Certain wrong reflections of normal people can usually be corrected by laying out the facts and reasoning. The pathological mental symptoms, on the other hand, cannot be made to reason, and cannot be corrected even in the presence of solid factual grounds and irrefutable good reasons, but arise with the disease and disappear as the disease gets better. Until the brain dysfunction disappears, practice cannot make it possible to give up this false perception. For example, a person believes that he or she has a noble lineage, is descended from the British royal family, is the illegitimate son of a British prince, and that his or her parents are only adoptive parents. In fact, his parents are local farmers and have never come into contact with any foreigner. This is a situation that cannot be corrected by objective facts, and in psychiatric terminology the above symptoms are a combination of delusions of descent and delusions of non-descent. Of course, even in psychiatric patients, not all mental activities are abnormal, but often partly normal and partly abnormal, and normal and abnormal manifestations are often intertwined. Therefore, some people who do not have professional knowledge tend to think that the patient is not sick, thus delaying the best time to diagnose and treat the disease. Therefore, timely detection and distinction between the false reflection of normal people and the mental symptoms of patients is one of the important means of early detection and early diagnosis and treatment of mental patients.