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I always wondered if thousands of years ago since people needed better hearing to survive they used they hearing more and it was developed better, but now not needing hearing as much to survive the brain does as you said filters the sounds out as unnecessary.

I guess that’s why some people are lite sleepers and some aren’t. An unusual sound can wake you up while a normal sound, even a train going by, wont wake you up.

It’s the survival instinct I guess.

A lot of times I can hear people talk but I can’t understand what they are saying because of background noise.

It’s almost as if nothing gets filtered.

What you are hearing is being heard but not processed correctly as it should be. Really I think mankind lived in a quieter world up until roughly the late 1800's and much more so the technology boom in the past 3-4 decades in audio/visual entertainment. It can likely even go right along with the increase in kids diagnosed as having ADD ADHD which IMO is simply misdiagnosed Auditory Processing Disorders giving ADD ADHD symptoms.

Not being able to follow conversation in background noise is part of it and even worse if the background noise is others talking.

Some of it maybe a lot of it has to do with the fact when Vestibular Damage occurs the ability to multitask or follow several processes at once decreases in proportion to the level of damage or Vestibular dysfunction. See if this makes sense. COGNITIVE ASPECTS OF VESTIBULAR DISORDERS

The survival portion of the brain the primitive part that demands you respond to danger can trigger Panic Attacks or even Phobic behavior. Let's take the fear of heights. True Phobia? Likely not here's why. The brain is constantly running it's own checks and it knows your limitations. Persons with Vestibular Damage often also have balance and coordination issues.

Here's an example. If you lets say go up on a roof the uneasy feeling sets in. That is your brain telling you hey you are in danger. The brain much like a computers processor also has a limit as too how much data or how many task it can process at one time without a crash or freezing up. The crash can be a Panic Attack or one worse.

The crash can also possibly cause you to go into what I can only describe as about a 30-60 minute fog where reality or sense of where you are, why you are there, how you got there, how long you've been there, etc takes a short vacation. First time it happened I thought I was having a stroke. It can happen lets say driving down a road you know real well. The onset is sudden and can last seconds or one I had lasted a couple of days. It's sensory overload. The processor is damaged LOL. The brain has to do Diskcheck and reboot.