The ideomotor [id-ee-uh-moh-ter] effect is a psychological phenomenon wherein a subject makes motions unconsciously; for example, the body produces tears in response to powerful emotions without the person consciously deciding to cry. As in involuntary responses to pain, the body sometimes reacts reflexively to ideas alone without the person consciously deciding to take action.
The effects of automatic writing (an alleged psychic ability allowing a person to produce written words without consciously writing), dowsing (a type of divination employed in attempts to locate ground water without the use of scientific tools), facilitated communication (a process by which a person supports the hand or arm of a communicatively impaired individual while using a keyboard), and Ouija boards have been attributed to the phenomenon. Mystics have often attributed these effects to paranormal or supernatural force. Many subjects are unconvinced that their actions are originating solely from within themselves.
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The Daily Omnivore 