But there are other reasons why hitting a baseball depends so heavily on the brain. These reasons have to do with the fact that the baseball is moving very fast and, at the major league level, is being thrown by a pitcher who does not want it to get hit. During the same time a major league hitter (like David Ortiz of the Boston Red Sox) is preparing to swing, he has to decide: "Is this a pitch I want to swing at?" And he also has to determine: "Where is the ball going to be?" and "When is it going to be there?" and "Hey, do I need to get out of the way before this hits me?!"
How all of this happens is actually a very tricky question. The problem comes from the fact that there is almost no time to make these decisions. How little time is "almost no time"? The average major league fastball gets to the plate in less than half a second.

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