For the causes of slow brain response, the specific reasons are as follows: 1, there is a lack of oxygen at the time of birth, incomplete brain development: If a child has symptoms of slow brain response, such as language, behavior later than children of the same age, and accompanied by intellectual impairment, the response is also slower, it is necessary to consider whether there is a lack of oxygen at the time of birth, or there is incomplete brain development, the need for cranial magnetic resonance examination; dementia: If a If the middle-aged and elderly people have slow brain reaction, memory loss, slow reaction, and even mental symptoms and abnormal behavior, the patient may have dementia and need to undergo cranial magnetic resonance and lumbar puncture examination; 3, cerebrovascular disease: If the elderly patients have slow reaction, ask the patient whether they have cerebrovascular disease in the past, such as cerebral infarction, cerebral hemorrhage after the brain function Decline, manifesting as a slower response.