I think you can train it, at least that's what I did with Stepmania in the early 2000s. I was watching in awe how people could manage to get perfect scores when I could hardly see the steps before they were at the bottom of the screen.

Eventually I learned to stop looking at the individual entities, and just "stare in the middle" kind of, and you stop "looking" and start sensing in a way, without looking directly at them. They might just flash by, but it's enough for your brain to be able to at least figure out what right finger to use.

Then it's just a bunch of training :) I think it's fairly established that "reaction time" is something you can train, you just need to always be at the limit and slowly make it faster and faster. Same with speed-reading/listening I think.