There is a related anecdote in "The Sports Gene" that suggests that MLB hitters do not track the ball in flight, but instead react to the pitchers' arm motion.

There is a related anecdote in "The Sports Gene" that suggests that MLB hitters do not track the ball in flight, but instead react to the pitchers' arm motion. As a result they have trouble hitting a motion they haven't visually trained against: http://www.eugenewei.com/blog/2013/8/23/the-pitchers-who-conquered-mlbs-best-hitters http://www.eugenewei.com/blog/2013/8/23/the-pitchers-who-con...