EVP Classification & Analysis Flashcards

What is stochastic resonance in the context of EVP research?

Answer: A method where adding calibrated background noise can paradoxically improve detection of weak signals

Stochastic resonance describes a phenomenon where a specific level of added noise can help weak signals emerge, proposed by some researchers as a possible EVP mechanism.

An investigator uses noise reduction software and discovers a voice underneath white noise. Why should the original unprocessed file always be preserved?

Answer: Noise reduction algorithms can create voice-like artifacts not present in the original

Aggressive noise reduction can generate spectral artifacts that sound like voices, so preserving the original ensures any disputed EVP can be verified against the unaltered source.

What does a flat-response microphone offer compared to a consumer microphone when capturing EVPs?

Answer: It reproduces all frequencies equally without boosting or cutting certain ranges

A flat-response microphone captures all frequencies evenly, preventing the coloration that consumer mics apply, which could distort EVP analysis.

Which of the following is a recognized criticism of using a Spirit Box as an EVP capture method?

Answer: Rapid scanning produces random radio fragments that confirmation bias can interpret as meaningful responses

The rapid channel-scanning of a Spirit Box produces brief snippets of actual radio broadcasts that listeners may unconsciously interpret as targeted paranormal communication.

During blind EVP review, why are transcripts or verbal suggestions about what a recording supposedly says withheld from panel listeners?

Answer: To prevent suggestion bias from causing listeners to hear the suggested words

Priming listeners with a suggested phrase dramatically increases the likelihood they will hear that phrase due to cognitive suggestion bias, invalidating the review.

An EVP recorded in an abandoned building contains a voice speaking a language the investigator does not recognize. What is the most methodologically sound next step?

Answer: Have the recording reviewed by a native speaker of the suspected language to verify content

Expert linguistic verification by a native speaker is essential before drawing conclusions about the content or meaning of a voice in an unfamiliar language.

What is reverse EVP analysis, and why is it considered methodologically problematic?

Answer: Playing recordings backwards to find hidden messages; problematic because reversed phonemes produce meaningless sounds the brain interprets as words via pareidolia

Reversed audio produces nonsensical phoneme combinations that the brain's pattern-recognition still assembles into perceived words, making reverse EVP highly susceptible to auditory pareidolia.