One is that there is a "soul" after death, also called a "ghost". "Ghost" is attached to a normal person, which is called "ghost upper body". When a ghost is possessed, its tone can be exactly the same as before it was possessed. There is an explanation that this situation is that "brain waves floating in space independently" forcibly occupy someone's brain, and its original brain waves will be temporarily covered, and people will temporarily lose their original consciousness and their behavior will be controlled by the occupied brain waves. That man is possessed by a ghost. This situation is also called "communication" and "faith" among the people, which means that ghosts are attached to people to spread information, and in Buddhism, they are called "possession".

There is also a situation in which the upper body of a ghost is a nightmare, which means that when sleeping, it screams because it is scared in the dream; Or feel something pressing on your body and you can't move. Scientifically speaking, nightmares are a disease. When people suddenly wake up and their muscles and nerves are not awake, they will be conscious and unable to move. This is called a nightmare. Often accompanied by depression, chest tightness, sleepers are awakened, and dreams of depression and dyspnea appear during sleep, mostly due to excessive fatigue, indigestion or excessive tension in the cerebral cortex.