After 26 years in practice, there are still things about the brain that amaze me, often that I first notice on myself.
Filtering (I guess “selective attention” sounds better) is one of them. We don’t notice it, but it’s definitely there.
Working at a jigsaw puzzle, I find myself looking for a specific piece, say, a white tab with a dark background and yellow stripe in the center. There may be several hundred pieces spread around me at the table, but the brain quickly starts filtering them out. In a fraction of a second I only notice ones with a white tab, then mentally those are broken down by the other characteristics. If it looks promising, I’ll look back at the space I’m trying to fit it in, mentally rotate the piece (another tricky thing if you think about it) and, if that seems to match, will pick up the piece to try. If it doesn’t fit the process repeats.
Dr. Allan M. Block
It’s a remarkable ability to see a relationship between two separate objects that isn’t always apparent.
But it’s not just sight. Although I’ve always loved music, it wasn’t until my own kids were in a band that I found the ability to break it down, removing the other instruments. It brings a remarkable clarity to suddenly hearing my daughter on the marimba, or son on the flute. Even with 70 other instrument playing around them.
You can try it yourself, listening to Keith Moon’s amazing drums on The Who’s “5:15.” Or in Bob Seger’s “Fire Lake.” Take out Seger and the instruments and you suddenly realize it’s the Eagles doing the background singing.
In Carly Simon’s “You’re So Vain,” a song you generally don’t attribute to the Rolling Stones, a little bit of focus will reveal Mick Jagger’s distinctive voice in the background chorus of “Don’t you, don’t you, don’t you?”
The ability isn’t something we created. It was there from our ancestors in the trees and caves. They used this ability to identify friend from foe, find the right path home, and pick out what was edible from what was poisonous. Like with so many other things, and without realizing it, our brains have retooled it for the world we now face, even if it’s just to find our car in the parking lot.
Sodium, calcium, potassium, and other ions flow in and out of nerve cells, an electrical impulse propagates though a network, matching incoming sounds and images to ones previously stored. That’s all it is, but the results are remarkable.
We take the everyday for granted, but should stop and think how amazing it really is.
Dr. Block has a solo neurology practice in Scottsdale, Arizona.