The parietal lobe can cause what's known as an "ideomotor effect" which allows muscles to move without the subject conciously being aware. This could explain how Ouija boards work. A good way to demonstrate this effect is to place both hands together and have the index fingers pointing upwards as if making the church steeple hand pose. If the subject stares at their two index fingers, they will appear to grow closer together without the subject's conscious intervention...
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