Frightening as these 'rattling ghosts' may be, there's never been a recorded case of anyone being killed by poltergeist activity. It can frighten the wits out of people but pretty much can't hurt you.
Most paranormal researchers believe that poltergeists are not 'ghosts' at all, but simple and sometimes complex manifestations of unconscious mental status, cases reported happen usually in children or teenagers. The Repressed psychic energy may suddenly expresses itself by projecting from the person who's troubled and paranormally be able to move objects or make noises. This frightens the person who is at the centre of the activity of course resulting in more fear that again feeds the escaping psychic energy.
But if the fear of the poltergeist activity is overcome then the circle is broken and the activity usually fades away.
In most cases poltergeist activity is an example of the mind's ability to influence matter that the American parapsychologist J B Rhine called psychokinesis. However, occasionally an independent spirit entity can or may harness the energy and give intelligent communication from the afterlife by means of rappings.
Some psychic groups have had some success with this technique asking for spirit people to knock out messages when we all place our hands around a table. So far, we've there have been a few intelligible sentences spelt out but also experiencing a great deal of nonsense .
In My opinion I suspect that our collective psychokinesis may be creating the effect from our own thoughts and expectations.
On a scientific note researched, some psychics say that poltergeist activity comes not from spirits or the powers of psychokinesis but from tulleric rays emitted from the earth's core. They believe that these 'Earth Fields' can be detected by dowsing. Underground rock strata, springs and streams distort these rays and result in areas of 'geopathic stress' that are most harmful to humans and some animals.
Dowsers also believe that the megalithic standing stones were designed to mark the lines of these earth fields. Named 'Ley Lines' by dowser Alfred Watkins he states.... they criss-cross Britain and converge on Glastonbury in Somerset, Stonehenge in Wiltshire and the pyramid of Cheops in Egypt. Studies have shown that many of the most famous cases of poltergeist activity have happened in buildings that have been built exactly on the intersection of two major Ley Lines.
To date there is no definitive answer as to the cause of poltergeist activity. It may be a result of a combination of human energies, earth fields and spiritual entities but equally all the theories may be completely wrong and there may yet be a scientific explanation. This strange enigma remains unsolved for now.
Happy Hunting,Veronica