Hummers, Those Strange Sounds

[ABNARTY]

Exactly. You feel them. I am guessing different frequencies and amplitudes have different affects on us. 

I used to live near large power lines (can't you tell    ). They did indeed have a strong "bzzzzz" easily heard. But that is just the audible portion. I imagine all that energetic vibration also resonates in the body and brain. 

You read about Bigfoot creating a sense of dread in people they can't explain. It could be that is some primal response humans have to predators.

Any current moving through a line also generates an electromagnetic field, That is the principle behind electromagnets, and an experiment I did as a kid involving multiple wraps of bell wire around an iron nail and then connecting a battery to the wire to generate current flow confirmed that. It turned the nail into a magnet.

So along with that "buzz" from high power transmission lines, there is also a dose of electromagnetic field to contend with. It has been shown that magnetic fields can affect brain function, because after all, the brain is just a sophisticated adding machine that runs on electrical impulses surging through nerves and neurons. While you were living near one, did you happen to notice the unhealthy look of the vegetation under it?(1) 'Nuff said.

I saw bigfoot once, over 40 years ago, and the memory has stuck with me to this day. "Sense of dread" does not begin to cover the feeling. "Scared shitless" is in the ballpark, near the entrance gate. I had a fully loaded 12 gauge pump shotgun in my hands, and would not shoot because I was afraid I might piss it off. Now whether that feeling is a function of a primal response humans have to predators, or a "feeling" generated more to protect the bigfoot than the human, is up for debate.(2) It never made a threatening move or noise towards me to cause the fear, it just was there, for no apparent reason. So all I know for sure is that it happens, and I don't spook easy. I didn't spook easy then, either. I'd already seen crap that would make strong men puke in fear, and had, I thought, developed a tolerance... but there it was, making me shake like a dog shitting razor blades in spite of that.

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1. I do not recall anything like that. Of course it was a long time ago and I did not pay attention to it. 

2. I agree that effect might be there to immobilize prey or just as likely to protect the predator. I don't know. With regards to your response and the subject at hand, it might simply be a direct triggering of something in our brain. It directly presses the fear button and bypasses everything else. That would indeed leave one feeling confused over the level of fear felt.