You can put down that DS, brain training doesn’t work. Pretty definitive.
“The answer, however, now appears to be a pretty firm no—at least, not through brain training. A pair of scientists in Europe recently gathered all of the best research—twenty-three investigations of memory training by teams around the world—and employed a standard statistical technique (called meta-analysis) to settle this controversial issue. The conclusion: the games may yield improvements in the narrow task being trained, but this does not transfer to broader skills like the ability to read or do arithmetic, or to other measures of intelligence.”