10-8-10: If you read the title and the news, you might conclude that doing brain (cognitive) exercises is bad for Alzheimers. But read the study closely and you'll see why the researchers said that brain exercises is still good for the brain!
I thought this might be of interest because of some exergames such as the Brain Bike, which combines both brain exercises and physical execises.
In a nut shell, brain exercises lengthy the duration of a healthy, pre-alzheimer brain, but once alzheimer sets in, it shortens the "bad stage" of progression of the disease.
In other words, a person will suffer the least amount of time if they do brain exercises.
So no matter what, keep your brain active! Doing brain exercises with physical exercise is the best, synergistic combination you can do!