Electronic Voice Phenomenon
2 pages (500 words)
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Similar to a dog whistle, EVP has a frequency that is too high for a human to hear, but for such things that are designed specifically for hearing higher frequencies - such as the audio recorder which uses magnets to record onto tape - it works.
In the 1990 movie Ghost, another form of communication is used to contact the spirit world, this time the form being Mediumistic Communication.