What Is It Like To Be A Baby?
wired.com
wired.com
At some point I learned of an experiment that proved walking was an instinct, the only thing stopping a newborn from walking is the lack of support and strength. Unfortunately, I don't remember the details of the experiment. But there are many animals that walk as soon as they are born.
Keep in mind though that "deficit" is usually judged within ages. So a young child isn't expected to have the same focus as an adult, just within the range of other children their age. Context also matters.
Still an interesting question, though. I've seen cats focus pretty hard on certain things.
When your cat crouches down and does that ass wiggle, he's pretty much driven everything else from his mind except ballistic calculations: distance to target, plotted trajectory, azimuth, elevation, etc.
It pays off though because he either catches the mouse or, if he is more relaxed, does a perfect four-point landing in your lap with a minimum of impact.