Great read thinks for sharing.
I remember coming home from kindergarten and having to practice piano before I could go play. I have a sister who is 7 years older than me and she wanted to take piano lessons, I was only 4 but remember asking if I could also. So I took them for 2.5 years, by the end I had learned to completely separate my left hand and fingers from my right hand and my fingers and read music. So music was the first written language I learned to read.
Right hand looking at the treble clef, doing as it says, playing the notes required, as the left hand and fingers look at the bass clef, playing different notes and often a different rhythm as required.
Too, many things going on at the same time to count them all.
Then there are people who have problems patting their head while rubbing their belly and singing a song.
Three main things going on.
“Most” peoples bodies will do multiple things at a time, but it must be taught to. It does not surprise me musician score high.