随着人类寿命的提高,长寿者越来越多,在这些人中有相当一部分人生活不能完全自理,因为老年人的肌体和机能会随年岁增大而逐渐衰退,尤其是大脑。脑衰老是脑细胞退化所致,以致反射与传达刺激系统迟缓,造成慢性智能缺损,称之为“老年性痴呆”,可以造成言语幼稚、反应迟钝、精神烦躁、哭笑无常、记忆力减退或丧失等等不良表现。 With the increase of human life expectancy, more and more longevity, in which a considerable part of the people can not fully take care of themselves, because the body and function of the elderly will gradually decline with age, especially the brain. Cerebral senescence is caused by the degeneration of brain cells, resulting in slow reflection and transmission of the stimulus system, resulting in chronic intellectual impairment, which is called “senile dementia.” It can cause naive speech, unresponsiveness, irritability, dumbness, memory loss or loss And so bad performance.