用脑过久、过度,脑会疲劳。脑的疲劳,除了用脑过度,体力劳动过度也会引起。曾有生理学家做实验,让人用指头不停地拉动滑轮上的重物,到完全拉不动为止。这时,用微弱的电流刺激肌肉,肌肉仍会收缩活动.但要让它拉滑轮,却动弹不得,这说明神经已经疲劳,它无力再指挥肌肉。之所以会出现这现象的道理很简单,全身大部分活动,无不听命于脑神经的指挥,管理指头活动的, Brain too long, excessive, brain fatigue. Brain fatigue, in addition to excessive use of the brain, physical exertion can cause. There were physiologists experimenting, people with a finger kept pulling the heavy objects on the pulley, until completely pulled can not move. At this moment, the muscles are still contracting with a weak current, but pulling the pulley while moving it does not indicate that the nerve is tired and unable to command the muscles again. The reason why this phenomenon appears is very simple truth, most of the activities of the body, all listen to the command of the brain nerve, the management of finger activities,