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Why Can the Same UFO Sound Get Different Descriptions?

People translate unfamiliar sounds into familiar comparisons such as bees, transformers, turbines or electricity, creating wide variation in reports.

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On this page

  • Everyday comparisons used by witnesses
  • How memory and expectation shape wording
  • Limits of reports without acoustic measurements
Preview for Why Can the Same UFO Sound Get Different Descriptions?

Introduction

People who report unusual UFO sounds often seem to disagree about what they heard, even when describing what may have been the same kind of event. One witness might recall a sound “like bees”, another “like a transformer”, and another “like an electric motor”. This variation does not necessarily mean they heard completely different noises. Instead, it reflects how people describe unfamiliar sounds using familiar experiences, how memory reconstructs unusual events, and the fact that almost no reports include objective acoustic measurements.

Witness Language illustration 1

Within historical UFO case collections, investigators have long noted that witnesses rely on analogies rather than technical descriptions. That makes sound reports valuable as personal observations, but less reliable as precise evidence for identifying a distinctive “UFO noise”. The wording often reveals as much about human perception and language as it does about the sound itself.[BUFORA]bufora.org.ukBUFORAINVESTIGATIONS | BUFORABUFORAINVESTIGATIONS | BUFORA

Why unfamiliar sounds become familiar comparisons

Humans rarely describe a sound by its exact frequency, pitch or acoustic spectrum. Instead, they compare it with something they already know. This is a normal feature of perception rather than something unique to UFO reports.

When witnesses encounter an unfamiliar noise, they often reach for comparisons such as:

  • Bees or insects, to convey a steady buzzing.
  • An electrical transformer, to suggest a low continuous hum.
  • A turbine or jet engine, to indicate a rising mechanical whine.
  • High-voltage electricity, to describe crackling or sizzling.
  • A distant generator or industrial machinery, to communicate a persistent low-frequency vibration.

These comparisons are not technical measurements. They are metaphors intended to help another person imagine an unfamiliar sound. Two listeners could hear broadly similar acoustic characteristics yet choose different comparisons because their personal experiences differ. Someone familiar with industrial equipment may think of electrical substations, while another person with little exposure to heavy machinery may think instead of insects or household appliances.

Investigators from organisations such as BUFORA have repeatedly noted that witnesses often explain unusual experiences by translating them into familiar language rather than reporting measurable acoustic properties.[BUFORA]bufora.org.ukBUFORAINVESTIGATIONS | BUFORABUFORAINVESTIGATIONS | BUFORA

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Vocabulary shapes what gets reported

A person’s background strongly influences the labels they choose.

For example:

  • A pilot may compare the same impression to an aircraft auxiliary power unit.
  • Someone living in the countryside may think of bees or power lines.
  • Another witness may simply report “a strange vibration” because no familiar comparison seems adequate.

This does not automatically imply different underlying sounds. It illustrates how language compresses complex sensory experiences into everyday references that other people are likely to understand.

Witness Language illustration 2

How memory and expectation influence wording

Descriptions are also affected by how memory reconstructs unusual events.

Psychological research shows that memory is not a perfect recording. People actively reconstruct experiences using prior knowledge, expectations and existing mental categories. For unfamiliar sounds, listeners naturally fit what they heard into the closest pattern already stored in memory. Research on auditory expectation demonstrates that predictability and prior experience influence both how sounds are perceived and how well they are remembered.[PubMed]pubmed.ncbi.nlm.nih.govInformation-Theoretic Properties of Auditory Sequences Dynamically Influence Expectation and Memory - PubMedJanuary 25, 2017…Published: January 25, 2017

In eyewitness research, another relevant finding is the role of verbalisation. Translating an unusual sensory experience into words can subtly reshape later recall, because language often captures only selected features while omitting others. Studies of “verbal overshadowing” show that describing complex sensory experiences may alter subsequent memory rather than preserving it exactly. Although most research concerns faces and voices rather than unexplained aerial events, the underlying principle highlights why later descriptions should not be treated as exact acoustic records.[Wikipedia]WikipediaEyewitness memoryEyewitness memory

Expectation can also influence which aspects of a sound become most memorable. A witness who believes an object resembles advanced technology may focus on electrical qualities, while someone expecting conventional aircraft may remember engine-like characteristics. These influences affect wording without necessarily implying deliberate exaggeration or fabrication.

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Audio-Visual Illusion in Speech Perception: McGurk Effect | Psychology 101

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Why reports rarely agree in precise acoustic terms

Unlike scientific acoustic investigations, almost all UFO reports are based entirely on human hearing.

Witnesses seldom record:

  • Frequency or frequency range.
  • Sound pressure level (volume).[silicon-steels.com]silicon-steels.comMarch 27, 2026 — A COMPREHENSIVE GUIDE TO IDENTIFYING AND TROUBLESHOOTING TRANSFORMER FAULTS USING SOUND 27 Mar 2026 Reading Volume: In…Published: March 27, 2026
  • Duration measured by a clock.
  • Directional measurements.
  • Spectral analysis.
  • Changes over time.[pmc.ncbi.nlm.nih.gov]pmc.ncbi.nlm.nih.govSource details in endnotes.

Without these measurements, investigators cannot determine whether two reported humming sounds were objectively similar or only appeared similar after witnesses chose comparable words.

Environmental conditions further complicate interpretation. Wind, echoes from buildings or hillsides, background traffic, vegetation and atmospheric conditions all modify how sound reaches different listeners. Even people standing only a short distance apart may notice different elements of the same acoustic event.

For that reason, investigators generally treat reported sounds as supporting observations rather than diagnostic evidence. The absence of instrumental acoustic data means comparisons between cases remain largely qualitative rather than quantitative.[BUFORA]bufora.org.ukBUFORAINVESTIGATIONS | BUFORABUFORAINVESTIGATIONS | BUFORA

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Psychoacoustics: Why do you hear sounds that don't exist? Hearing

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What this means for comparing UFO sound reports

The wide variety of sound descriptions does not necessarily indicate that witnesses experienced completely different phenomena. Nor does it demonstrate that a unique acoustic signature exists.

Instead, the historical record suggests three consistent patterns:

  • Witnesses usually describe unfamiliar sounds by comparing them with familiar objects or technologies.
  • Individual memory, vocabulary and expectations influence which comparison they choose.
  • Without objective acoustic measurements, different verbal descriptions cannot reliably be interpreted as evidence of different underlying sounds.

This helps explain why one historical catalogue may contain references to humming, buzzing, turbines, electricity and bees without implying several distinct categories of UFO noise. Many descriptions may simply represent different linguistic attempts to communicate broadly similar auditory impressions.

Consequently, researchers examining reported UFO sounds generally place greater weight on patterns across many independent reports than on the exact wording used by any individual witness. The comparisons themselves remain informative, but they are best understood as human descriptions of unusual listening experiences rather than precise acoustic measurements.

Witness Language illustration 3

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Endnotes

1. Source: bufora.org.uk
Link:https://bufora.org.uk/documents/BUFORAjournalVolume1No.1Summer1964.pdf

Source snippet

Vol. lNo. ISUMMER 1964...

2. Source: Wikipedia
Title: Eyewitness memory
Link:https://en.wikipedia.org/wiki/Eyewitness_memory

3. Source: Wikipedia
Title: Verbal overshadowing
Link:https://en.wikipedia.org/wiki/Verbal_overshadowing

4. Source: bufora.org.uk
Title: BUFORAINVESTIGATIONS | BUFORA
Link:https://www.bufora.org.uk/investigations

5. Source: bufora.org.uk
Title: BUFORARESEARCH | BUFORA
Link:https://www.bufora.org.uk/research

6. Source: pubmed.ncbi.nlm.nih.gov
Link:https://pubmed.ncbi.nlm.nih.gov/28121017/

Source snippet

Information-Theoretic Properties of Auditory Sequences Dynamically Influence Expectation and Memory - PubMedJanuary 25, 2017...

Published: January 25, 2017

7. Source: pubmed.ncbi.nlm.nih.gov
Link:https://pubmed.ncbi.nlm.nih.gov/11762864/

Source snippet

Earwitness testimony: effects of exposure and attention on the face overshadowing effect - PubMed...

8. Source: pmc.ncbi.nlm.nih.gov
Link:https://pmc.ncbi.nlm.nih.gov/articles/PMC12006449/

9. Source: pmc.ncbi.nlm.nih.gov
Link:https://pmc.ncbi.nlm.nih.gov/articles/PMC11588100/

10. Source: bufora.org.uk
Title: investigating ufology 2018
Link:https://www.bufora.org.uk/post/investigating-ufology-2018

11. Source: pmc.ncbi.nlm.nih.gov
Link:https://pmc.ncbi.nlm.nih.gov/articles/PMC5125666/

12. Source: pmc.ncbi.nlm.nih.gov
Link:https://pmc.ncbi.nlm.nih.gov/articles/PMC2667065/

13. Source: bufora.org.uk
Link:https://www.bufora.org.uk/about

14. Source: bufora.org.uk
Link:https://www.bufora.org.uk/bufora-publications/bufora-research-bulletins-reports

15. Source: bufora.org.uk
Title: HOM E | BUFORA
Link:https://www.bufora.org.uk/

16. Source: bufora.org.uk
Link:https://www.bufora.org.uk/blog

17. Source: bufora.org.uk
Link:https://www.bufora.org.uk/bufora-publications

18. Source: bufora.org.uk
Title: ARTICLE S | BUFORABUFORA ARTICLES Calvine Revisited
Link:https://www.bufora.org.uk/articles

19. Source: pubmed.ncbi.nlm.nih.gov
Link:https://pubmed.ncbi.nlm.nih.gov/9042739/

20. Source: criminal-justice.iresearchnet.com
Title: verbal overshadowing
Link:https://criminal-justice.iresearchnet.com/forensic-psychology/eyewitness-memory/verbal-overshadowing/

Additional References

21. Source: transformergrid.com
Link:https://transformergrid.com/technical-library/transformer-sound-vibration-engineering-guide/

Source snippet

Transformer Sound and Vibration Engineering Guide | TransformerGridJuly 22, 2026 — Technical reference prepared by TransformerGrid’s engi...

Published: July 22, 2026

22. Source: silicon-steels.com
Link:https://www.silicon-steels.com/blog/industry-knowledge/transformer-noise-diagnosis-guide.html

Source snippet

March 27, 2026 — A COMPREHENSIVE GUIDE TO IDENTIFYING AND TROUBLESHOOTING TRANSFORMER FAULTS USING SOUND 27 Mar 2026 Reading Volume: In...

Published: March 27, 2026

23. Source: nature.com
Link:https://www.nature.com/articles/s44159-024-00287-z

24. Source: ora.ox.ac.uk
Link:https://ora.ox.ac.uk/objects/uuid%3Ad0bc067a-af78-4537-b4e0-66f50f501074

Source snippet

influence of expectation and experience on auditory perception - ORA - Oxford University Research ArchiveFebruary 25, 2026 — Image: Thesi...

Published: February 25, 2026

25. Source: youtube.com
Title: These Illusions Fool Almost Everyone
Link:https://www.youtube.com/watch?v=Sn07AMCfaAI

Source snippet

Audio-Visual Illusion in Speech Perception: McGurk Effect | Psychology 101...

26. Source: sciencedirect.com
Link:https://www.sciencedirect.com/science/article/abs/pii/S1388245709002004

27. Source: frontiersin.org
Link:https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2013.00789/full

28. Source: cambridge.org
Link:https://www.cambridge.org/core/journals/organised-sound/article/abs/memory-expectation-and-the-temporal-flux-of-acousmatic-music/D885FF321A27EB78C8775EAE7D06E3D8

29. Source: vlex.co.uk
Link:https://vlex.co.uk/vid/the-impact-of-irrelevant-846731191

30. Source: nicap.org
Link:https://www.nicap.org/ufology/ufochap4.htm