The planchette is guided by unconscious muscular exertions like those responsible for table movement. Nonetheless, in both cases, the illusion that the object (table or planchette) is moving under its own control is often extremely powerful and sufficient to convince many people that spirits are truly at work ... The unconscious muscle movements responsible for the moving tables and Ouija board phenomena seen at seances are examples of a class of phenomena due to what psychologists call a dissociative state. A dissociative state is one in which consciousness is somehow divided or cut off from some aspects of the individual's normal cognitive, motor, or sensory functions.