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Acoustic analysis of inexplicable banging noises recorded during alleged poltergeist activity shows a different sound signature from ordinary banging noises, according to a paper by Dr Barrie Colvin in the latest SPR Journal.

Dr Colvin analysed 10 separate recordings of alleged poltergeist knocking sounds obtained from around the world over 40 years, from a 1960 case in Sauchie, Scotland, to one in Euston Square, London, in 2000, and including recordings made in the famous Enfield poltergeist case in north London during 1977–79. Though the two types of rap sound rather similar, they are actually acoustic­ally different, and acoustic experts have been unable to replicate the pattern of the alleged poltergeist raps.