au·tom·a·tism (ô-tŏmˈə-tĭzˌəm)

1. The involuntary functioning of an organ or other body structure that is not under conscious control, such as the beating of the heart or the dilation of the pupil of the eye.
2. The reflexive action of a body part.
3. An act performed without intent or conscious exercise of the will, often without realization of its occurrence, as for certain types of epilepsy.
4. A condition in which one is consciously or unconsciously, but involuntarily, compelled to the performance of certain acts. Also called telergy.