Mushin (無心; Japanese mushin; English translation "no mind") is ...wikipedia - 09 Sep 2015
Mushin (無心; Japanese mushin; English translation "no mind") is a mental state into which 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.