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 This state is called “vegetative state”, and patients in this state are called “vegetative”. What are the examination methods of cognitive neurological loss? 1, functional brain imaging Brain functional imaging technology is a class of non-invasive neurological activity measurement an imaging technology. Brain function research mainly explores the neural basis of cognition and emotion, and brain function imaging is very important. 2.Cranial MRI examination Cranial MRI examination is an MRI examination of the brain, which is used to observe whether there are lesions in the brain and can clarify whether the patient is caused by structural changes in the brain. Intracranial tumors often cause epilepsy, and MRI has an extremely high rate of diagnostic confirmation for low-grade astrocytomas, ganglia, gliomas, arteriovenous malformations and hematomas in the brain. 3.Electroencephalography (EEG) EEG is a graph obtained by recording spontaneous biopotentials from the brain on the scalp with amplification through an instrument. 4.Neurological examination Neurological examination is to determine whether there is damage to the nervous system and the location and extent of the damage, i.e. to solve the “localization” diagnosis of the lesion. The examination should be carried out in a certain order and in combination with the general physical examination. Usually, the cranial nerves are examined first, including their motor, sensory, reflex and vegetative functions; then the motor system and reflexes of the upper and lower extremities are examined sequentially, and finally the sensory and vegetative nervous systems are examined. The examination should also be focused according to the history and initial observations, especially in the examination of critically injured patients, which is more important. In addition, cortical dysfunction such as consciousness, aphasia, loss of use, and loss of recognition also belong to the scope of neurological examination.