Regan is a 12 year old girl living with her Mother in Washington, when she starts developing unusual symptoms she is taken to various doctors for medical help. After many physical and psychological tests are taken and all possibilities are ruled out the Mother considers exorcism. Battle ensues between two priests and the demon within Regan who is unwilling to let go of her body. Regan herself unawares of what has happened to her and taken over by evil has sunk back into the subconsciousness of her mind leaving the demon to speak for her in a manner not even acceptable to the most despicable of humans.
Fig 3 . The Exorcist, Movie Still, 1973, [photography] http://t1.gstatic.com/images?q=tbn:ANd9GcQEuZhNISwoYgqowYvUjKKxOtIBOmotMzte-nTpxlHYckUMAxDHjOqpmSMS