What math exactly does the brain do while you are trying to catch a ball? Just because you can mathematically model the trajectory of a ball doesn't mean your brain is using that model. The standard method humans use to catch a ball is stabilization at a few updates every second, while the classic method used to tract the trajectory of a ball is newton's method of fluxions. Humans suck at both compared to computers; though the former isn't as much a shameful a loss as the latter.