Spirit possession is an unusual or altered state of consciousness and associated behaviors purportedly caused by the control of a human body by spirits, ghosts, demons, or gods. The concept of spirit possession exists in many cultures and religions, including Buddhism, Christianity, Haitian Vodou, Hinduism, Islam, Wicca, and Southeast Asian, African, and Native American traditions. Depending on the cultural context in which it is found, possession may be considered voluntary or involuntary and may be considered to have beneficial or detrimental effects on the host. In a 1969 study funded by the National Institute of Mental Health, spirit possession beliefs were found to exist in 74% of a sample of 488 societies in all parts of the world, with the highest numbers of believing societies in Pacific cultures and the lowest incidence among Native Americans of both North and South America. As Pentecostal and Charismatic Christian churches move into both African and Oceanic areas, a merger of belief can take place, with "demons" becoming representative of the "old" indigenous religions, which the Christian ministers attempt to exorcise. Abrahamic traditions Christianity From its beginning, Christianity has held that possession derives from the Devil, i.e. Satan, his lesser demons, the fallen angels. In the battle between Satan and Heaven, Satan is believed to engage in "spiritual attacks", including demonic possession, against human beings by the use of supernatural powers to harm them physically or psychologically. Prayer for deliverance, blessings upon the man or woman's house or body, sacraments, and exorcisms are generally used to drive the demon out. Some theologians, such as Ángel Manuel Rodríguez, say that mediums, like the ones mentioned in Leviticus 20:27, were possessed by demons. Another possible case of demonic possession in the Old Testament includes the false prophets that King Ahab relied upon before re-capturing Ramoth-Gilead in 1 Kings 22. They were described as being empowered by a deceiving spirit. The New Testament mentions several episodes in which Jesus drove out demons from persons. Whilst most Christians believe that demonic possession is an involuntary affliction, some biblical verses have been interpreted as indicating that possession can be voluntary. For example, Alfred Plummer writes that when Devil entered into Judas Iscariot in John 13:27, this was because Judas had continually agreed to Satan's suggestions to betray Jesus and had wholly submitted to him. The New Testament indicates that people can be possessed by demons, but that the demons