Electronic voice phenomena (EVP) are sections of static noise on the raio or electronic recording media that are interpreted by paranormal investigators as voices speaking words usually attributed to ghosts or spirits. Recording EVP has become a technique of those who attempt to contact the souls of dead loved ones or during ghost hunting activities. In addition to deceased spirits, various paranormal investigators say that EVP could be due to psychic echoes from the past, psychokinesis unconsciously produced by living people, and the thoughts of aliens. According to parapsychologist Konstantin Raudive, who popularized the idea, EVP are typically brief, usually the length of a word or short phrase.