Further to my earlier post on the Wired article (here), another take on bilingualism on how this trains the brain. Quote:
Through this fine-tuning of the nervous system, people who can master more than one language are building a more resilient brain, one more proficient at multitasking, setting priorities, and, perhaps, better able to withstand the ravages of age, a range of recent studies suggest.
Indeed, some preliminary research suggests that people who speak a second language may have enhanced defenses against the onset of dementia and delay Alzheimer’s disease by an average of four years, as WSJ reported in 2011.
The ability to speak more than one language also may help protect memory, researchers from the Center for Health Studies in Luxembourg reported at last year.