Fugue state

A fugue state describes a state of mind where a person experiences a break in identity and attempts to run away from some perceived threat, usually something abstract such as the person's identity. It is often triggered by stress.

People who enter into a fugue state may disappear, running away to a completely different geographical region and assuming another identity.

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Also called a "fugue state" by non-psychologists is the state of mind attained by a gifted pianist or athlete where the person attains a high degree of focus and attention to their art or actions. This is also a dissociation from one's surroundings, to concentrate on the work at hand.