Paranormal rappings associated with apparent poltergeist activity have been described for many hundreds of years. It is only now that an interesting pattern has been discovered within the fine detail of the paranormal rapping sounds. No explanation can be found for this pattern at present.Whereas raps and knocking sounds produced by ordinary means exhibit a normal acoustic pattern, those recorded in alleged poltergeist cases show quite a different sound signature.
Dr Colvin has analysed recordings of alleged poltergeist knocking obtained from around the world over a 40-year period. The earliest was a recording made by a local physician at Sauchie (Scotland) in 1960 and the most recent was obtained from a poltergeist case at Euston Square, London in 2000.
Whilst the two types of rap sound rather similar, they are actually acoustically different, although the effect is only made apparent when the recordings of raps are submitted to detailed analysis.The question arises as to how such a sound is generated. There is evidence which points to the sound arising from within the structure of a material rather than from the surface of it, as would be the case with a normally-produced rapping sound. This phenomenon will be examined further in future investigations of poltergeist activity.
Copyright: Society for Psychical Research 2011