The Collaborative International Dictionary of English v.0.48:

Automatism \Au*tom"a*tism\, n.
   The state or quality of being automatic; the power of
   self-moving; automatic, mechanical, or involuntary action.
   Specifically: (Metaph.) A theory as to the activity of
   matter.
   [1913 Webster]

WordNet (r) 3.0 (2006):

automatism
    n 1: any reaction that occurs automatically without conscious
         thought or reflection (especially the undirected behavior
         seen in psychomotor epilepsy)

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "automatism":
   Ouija, automatic control, automatic writing, automation,
   automatization, bad habit, blind impulse, characteristic,
   compulsiveness, conditioning, creature of habit, custom, echolalia,
   echopraxia, force of habit, habit, habit pattern, habitude,
   impulse, instinct, instinctiveness, involuntariness, levitation,
   materialization, pattern, peculiarity, planchette, poltergeist,
   poltergeistism, practice, praxis, psychography, psychorrhagy,
   reflex action, second nature, self-action, self-activity,
   self-determination, self-direction, self-government, self-motion,
   self-propulsion, self-regulation, sheer chemistry,
   spirit manifestation, spirit rapping, stereotype,
   stereotyped behavior, table tipping, telekinesis, teleportation,
   telesthesia, trance speaking, trick, unwilledness, usage, use, way,
   wont