For many years, things I heard and read always referred to a poltergeist as a "playful" spirit, usually that of a child, that created disturbances of physical objects, and could be noisy. More recently, I hear it said that these disturbances are not created by other-worldly spirits at all, but are the manifestations of inner turmoil of an individual around which these things happen? What has the most recent paranormal research and investigation shown?
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