Decades ago I read about NASA's silent room, with the big wood spikes on the walls. All you can hear is your heartbeat and this high pitched whine. NASA figured out the high pitched whine was the nervous system (like, your brain).

I've got some mild tinnitus. I always wonder if it's my brain listening to itself. That little recursive loop is enough to distract me, even if it's not true.

> NASA figured out the high pitched whine was the nervous system (like, your brain).

I’d love to know more about this if you have any info to share.

Nada Yoga might give some information as well, it's not a new idea.

I wish I could find a better source. My memory is of a wired article, on paper. This touches on the "hiss" from the nervous system - https://www.americanscientist.org/article/quietest-places-in...

what if the brain just runs an, "event loop" and the frequency is just the sample rate for responding to events?

That would require synchronous processing. In reality you have a trillion async threads.

It’s self-oscillating

but that would mean everyone should have tinnitus but not everyone does. I certainly never had it until midlife.

Maybe the cognitive ability to tune it out is what's failing. Old worn down brain issues.

Wait, what happens if the high pitched whine is always there when you’re in a somewhat quiet place? Is that still the nervous system?

Related: https://www.smithsonianmag.com/smart-news/earths-quietest-ro...

The sweet sound of you being plugged to a machine in a dream like state where a day takes 1ns.

I always wondered why I could hear my heart beating so hard when I would go on a run, especially pronounced wearing ear-buds.

stronger heart contractions and increased dilation during exercise therefore ear innards picks up on this?

1. Earbuds muffle external sounds, so you'll more likely notice internal sounds, like swallowing or your heartbeat:

2. Earbuds fill your ear canal, and as your ear canal flexes slightly due to your heartbeat, the earbud rubs against the skin inside your ear, and you hear that.