"As fun as they may be to play, brain training games have one
fundamental flaw: the improvements you see the more you perform the
exercises are not evidence of your brain becoming better, smarter,
or faster. Instead, the improvements are the same sorts of
improvements that you will see in almost any task: the more you
practice, the better you get at it. You haven't gotten any smarter,
you've just learned how to perform the task at hand faster and more
efficiently which translates into a better score.
"An example from one recent brain training game, The Amazing
Brain Train, is illustrative of my point. One of the mini-games is
called "Pond Sum". In this exercise the idea is to guide a frog
across a grid of lily pads laid out on a pond. Each pad is numbered
and the idea is to guide the frog in such a way that the sum of all
of the numbers that he jumps on will equal the number displayed at
the top of the screen."