talk about counterintuitive

[novapsyche]

Keeping the mind active staves off dementia at first but speeds it up later: Brain training games, crosswords and puzzles help maintain a healthy mind in the elderly but can eventually speed up dementia late on in life, new study claims.

I must admit: I don't understand the particulars of this study as they have been reported. I will need to delve into the study's actual details to puzzle out the findings and their implications.

Edit: Ah, now it makes more sense. See this article in MedPage Today.