Ok humans cant hear higher than 20000 megahertz. Thats what they told you. ?

Question

But how do you know the human brain cannot detect those faint vibrations and be affected by it. Question is...... are we being trained like dogs an don't even know it? From the buzz of electronic devices

Answer 1

I have heard that when presented with two identical recordings of sounds, one in the typical range of human hearing 20Hz to 22kHz, and the other from 20Hz to 40kHz, people will often report the recording with a higher range as sounding more real, even though they can not hear individual tones above 22kHz.  So it is possible, even mildly likely that the ear picks up on higher frequencies but that somehow does not get transmitted to the conscious hearing part of the brain.  On the other hand, I heard this from my Electrical Engineering/Music professor, who brilliant in many ways, was really quite crazy.  So I wouldn't stake my life on that bit o' info.  But as I recall, they were working on CD's with greater dynamic range to get the 20kHz to 40 kHz range for exactly this reason.

Answer 2

Not to nitpick, but the wave length of a 20000MHz sound wave would be around 15000 picometers, perhaps not much more than a hundred times the size of a nitrogen (N2) molecule, I rather doubt that frequency could even propagate in normal pressure air.

(Yes I know you meant 20000 hertz (Hz) or 20KHz, but still, you did write megahertz)  

Answer 3

Good question!! I guess it is possible! Strange thing though, I can heat bats, but my boyfriend can't. He also can't hear high pitched electrical buzzing sounds that I can hear. Maybe he is already trained? Or perhaps I am??!

How would we be trained by the buzzing?! I think it is possible, and only likely if there are massive conspiracies, which I'm sure there are!

Answer 4

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Answer 5

Presumably you mean 20 kiloHertz?  You wanna watch those powers of ten.  Turns out you're six powers of ten out which is a million times.

(I'll let that one slide because it's an interesting question).

.It is likely that such vibrations could be perceived, but not by the ears. In fact any sounds beyond about 10kHz can't really be discerned in pitch although you can detect their presence.

The physical limitation is that the cochleal fibrils simply don't generate any output beyond about 20kHz

Higher frequency vibrations might be perceived, but they won't be perceived directly as sound, possibly as a sensation or even a "feeling". The physical reasons for this are potentially manifold.  If the acoustic wave is of high enough amplitude, it could possibly cause microscopic cavitation around the nerve endings in the skin.  This might be perceived as a tickling sensation, or possibly even cold or heat.  It could be that the wave sets up an acoustic resonance with some other sensory apparatus, causing other peculiar sensations.

I doubt wether such sounds could be used to "train" a person directly, they might cause >influence< e.g. influence you to want to go elsewhere because you suddenly started to feel quite strange.

I'm sure someone somewhere has already "weaponised"  such ultra-sonic effects and has already deployed them, successfully or otherwise, in operational theatres.

Cheers.

Answer 6

I'm pretty sure that physiologically, 20k hz is the limit. If its too high, the ossicles in your ear won't even vibrate because they're so small, and the sound won't enter the cochlea. You won't hear a thing.

Answer 7

yes we can hear a lot better than we allow ourselves to

we can smell better

taste better

and all that junk

but humans are seeing dominant

when people go blind all of their other senses go up

Answer 8

It is generally recognised that humans can hear a frequency range of 40 Hz to 20 Khz, with a most sensitive centre range about a frequency of 1 kHz. Most humans beyond about 26 years of age loose about 1 Hz on their top frequency, range, everyday as they age! I am not certain but it could well be that some young people can hear frequencies slightly above 20 kHz.