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419

AI data centers face increasing complaints about inaudible but 'felt' infrasound — citizens complain high- and low-frequency sounds do not register on decibel meters but cause adverse health effects (www.tomshardware.com)

submitted 15 hours ago by throws_lemy@lemmy.nz to c/technology@lemmy.world

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[–] fiat_lux@lemmy.zip 3 points 6 hours ago (1 children)

I believe the poster is referring to The Ghost in the Machine, Published in the Journal of the Society for Psychical Research, Vol.62, No 851 April 1998 (pdf)

[–] merc@sh.itjust.works 1 points 2 hours ago (1 children)

Ok, that's a paper that attempts to explain the feeling that a building might be haunted. There's nothing in there about causing people to hallucinate. They talk about the supposed "resonant frequency of the eye", but then they say:

The resonant frequency is the natural frequency of an object, the one at which it needs the minimum input of energy to vibrate. As you can see from above, any frequency above 8 Hz will have an effect and some sources quote 40Hz

If the values are that vague, then there is no resonant frequency. There may be frequencies that transmit vibrations to the eye, but with a big enough speaker you can cause anything to vibrate.

The closest the get to hallucinations is to say that "the eyeball would be vibrating which would cause a serious "smearing"of vision. It would not seem unreasonable to see dark shadowy forms caused by something as innocent as the corner of V.T.’s spectacles." So, no hallucinations, just some blurry vision that might vaguely count as an excuse for seeing a ghost if your eye is vibrating significantly. Notice that that's all just speculation, saying "this seems like it could be possible" rather than actually testing for that hypothesis.

[–] fiat_lux@lemmy.zip 1 points 1 hour ago

We had slightly different readings.

As he was writing he became aware that he was being watched, and a figure slowly emerged to his left. It was indistinct and on the periphery of his vision but it moved as V.T. would expect a person to. The apparition was grey and made no sound... V.T. was unable to see any detail and finally built up the courage to turn and face the thing. As he turned the apparition faded and disappeared.

He experienced a visual disturbance in his periphery manifesting as the false perception of a person. Even without it being interpreted as a person, that's a textbook mild hallucination.

Once V.T. knew this he calculated the frequency of the standing sound wave ... 18.97Hz ... plus or minus 10%

Table IV on page 212 of this book shows frequencies causing disturbance to the eyes and vision to be within the band 12 to 27 Hz.

Most interestingly, a NASA technical report mentions a resonant frequency for the eye as 18 Hz (NASA Technical Report 19770013810).

He cited two sources inline with ranges narrower than 8-40Hz which indicate that vision can be affected at the same frequencies he measured in the lab. He even noted that everyone would have slightly different resonant frequencies.

No, it's not a full research paper, but it is the citation you requested.