Just as physical exercise can aid in the prevention of numerous bodily ailments, mental exercise, in the form of bilingualism, can assist in staving off diseases of the mind. Nancy Shute of NPR.org writes:
The latest evidence from the bilingualism-is-good-for-you crew comes from Brian Gold, a neuroscientist at the University of Kentucky College of Medicine in Lexington. To test the idea, he had older people who grew up bilingual do an attention-switching task, a skill that typically fades with age. Earlier research has found that people bilingual since childhood are better at the high-order thinking called executive function as they age.
Neuroscientists think that having more reserve brain power helps compensate for age-related declines in thinking and memory, and may help protect against the losses caused by Alzheimer’s and other forms of dementia. The study was published in the Journal of Neuroscience.