Brain Teasers May Speed Up Dementia, Alzheimer's By Steve Vivian, Newser User Posted Sep 2, 2010 11:14 AM CDT Promoted on Newser Sep 2, 2010 2:04 PM CDT 13 comments Comments Solving Rubik's Cubes: Good if you don't have dementia. (AP) (User Submitted) – Sudoku, crosswords, and even listening to the radio may not be all they're cracked up to be when it comes to staving off mental decline. A study by researchers at Rush University Medical Center in Chicago indicates that once diagnosed with dementia and Alzheimer's, increased brain activity may actually accelerate the rate of decline. For those without dementia, the rate was reduced, in line with previous studies. Read the full article.