Loss of cognitive neurological function is one of the manifestations of a vegetative state. Vegetativepatient: The cortical function is severely impaired, and the victim is in an irreversible state of deep coma with loss of conscious activity, but the subcortical center can maintain voluntary respiratory movement and heartbeat, this state is called “vegetative state”, and the patient in this state is called The patient in this state is called “vegetative state”, and the patient in this state is called “vegetative person”. Except for some instinctive neural reflexes and the ability to metabolize substances and energy, the cognitive ability (including the ability to recognize one’s own existence) is completely lost and there is no active activity. It is also called vegetative state and irreversible coma. The brainstem of a vegetative person is still functional and can digest and absorb nutrients when they are delivered to his or her body, and can use this energy to maintain the body’s metabolism, including respiration, heart rate, and blood pressure. It can also produce some instinctive reflexes to external stimuli, such as coughing, sneezing and yawning. However, the organism no longer has consciousness, perception, thinking and other higher neural activities that are unique to humans. The EEG shows spurious waveforms. The vegetative state is different from brain death, which refers to the death of the whole brain, including the brainstem. In brain death, there is no voluntary breathing and heartbeat, and the EEG is a straight line. It is controversial whether to treat the vegetative state by providing various kinds of nutrition at high cost to maintain this state or to give up the maintenance of their life. What are the symptoms that are easily confused with it? 1, cognitive dysfunction is one of the psychological disorders, cognitive defects or abnormalities. Cognition refers to the process by which the human brain receives external information, processes it and converts it into internal mental activity so as to acquire knowledge or apply it. It includes memory, language, visual-spatial, executive, computational and comprehension judgment. Cognitive impairment refers to the impairment of one or more of the above cognitive functions. Dementia can be diagnosed when 2 or more of the above cognitive domains are involved and affect the individual’s daily or social abilities. 2. Impairment of cognitive function Cognitive function is a complex process of mental activity. When a person’s cognitive function is altered, a series of changes will occur, including thinking, emotion, will and behavior. People with cognitive function deficits have special personality characteristics, such as withdrawn, introverted, sensitive, lack of logic in thinking, and good fantasy. Some people call this a schizophrenic-like personality or schizophrenic-like latent qualities (or susceptibility qualities). And 50-60% of schizophrenia patients have schizoid susceptibility before the disease.