The Brain That Invented Ghosts

The Brain That Invented Ghosts — Why Can't Humans Tolerate Misfortune Without a Reason?

Tens of thousands of years ago, everything beyond the door was territory of the unknown for humankind. Lightning striking without warning, a drought stretching on for months, an epidemic that leaves a hunting companion, healthy just yesterday, sick and dying from something unseen. In an age with no science and no medicine, humans were helpless in the face of this chaos.

The brain devised a strategy for coping with this fear. Psychologist Arie Kruglanski named this tendency the "need for cognitive closure" — a mind that cannot bear a state in which the cause is unknown.

Nothing is harder for the human brain to endure than a state where cause and effect fail to connect — where misfortune strikes for no reason at all. The helplessness of having no answer to "why me?" corrodes the mind from within. So the brain manufactures an imagined causality. It's the moment people began to believe that trees, rocks, and wind carry a soul and intention just like ours. That is the essence of animism and shamanism.

1. A state with no reason: "Why does the child suddenly have a fever and lie dying?" → No countermeasure, no way to predict it. The whole community is paralyzed.
2. A state with a manufactured reason: "An evil spirit is devouring the child's soul." → The instant a cause is identified, the fear moves into territory you can act on.

The moment misfortune is given the label "ghost," a person breaks free of that helplessness. If the cause is an evil spirit, there's something you can do about it. Call a shaman for a gut ritual, scatter red beans by the door, smear the blood of an animal. Even inventing a ghost that doesn't exist was a way to assign the world a reason, and through that reason, gain a sense of control.

This ancient response — assigning a physical cause to an invisible fear, then blocking it to protect one's life — is called byeoksa (辟邪, "warding off evil").

Byeoksa was not superstition; it was a cognitive strategy. The first shield built to protect the mind from an unknowable chaos.

And to physically fix this defense in place, humankind set a wooden plank across the mouth of a cave, drawing a line that divided inside from outside. That was the beginning of the door.