Mushin (mental state)
Mushin (無心; Japanese mushin; English translation "no mind") is a mental state into which very highly trained martial artists are said to enter during combat. They also practice this mental state during everyday activities. The term is shortened from mushin no shin (無心の心), a Zen expression meaning the mind without mind and is also referred to as the state of "no-mindness". That is, a mind not fixed or occupied by thought or emotion and thus open to everything.
Mushin is achieved when a person's mind is free from thoughts of anger, fear, or ego during combat or everyday life. There is an absence of discursive thought and judgment, so the person is totally free to act and react towards an opponent without hesitation and without disturbance from such thoughts. At this point, a person relies not on what they think should be the next move, but what is their trained natural reaction or what is felt intuitively. It is not a state of relaxed, near-sleepfulness, however. The mind could be said to be working at a very high speed, but with no intention, plan or direction.