The practice of attempting to record ghosts is called Electronic
Voice Phenomena (EVP). The sounds that make up EVP are apparently sonic events of unknown origin, which
can be heard, and sometimes captured in recordings, on various
types of electronic apparatus, including tape recorders and even
radio equipment. The voices on the tapes take on diverse forms,
sometimes seeming to speak in tongues, singing or speaking in
gibberish. The messages often make a sort of backward sense as
though communication is difficult. They can also apparently call by
name and speak directly to researchers. They can be heard over
telephones and as anomalous interference on tape recordings. Some
of them seen to enjoy engaging in dialogue, answering questions or
supplying personal information about the researchers, possibly as a
way of achieving credibility.
