Canadian scientists find that bilingualism can protect against dementia
The bilingualism of many South Africans could save them from dementia.
Canadian scientists have found that bilingual people can save brainpower and complete tasks without using brain frontal brain, which are vulnerable to ageing. Many people in Canada speak French and English.
"After years of daily practice managing interference between two languages‚ bilinguals become experts at selecting relevant information and ignoring information that can distract from a task‚" said Ana Inés Ansaldo‚ a professor at the University of Montreal.
Monolingual brains are not so lucky. People who can speak and understand only one language require the use of multiple brain regions to complete tasks‚ making them less able to stave off dementia.
"Bilinguals juggle two languages at a time which requires more effort from the brain‚" said Professor Emanuel Bylund‚ a lecturer in linguistics at Stellenbosch University.
"You have to constantly suppress one language so that it doesn’t come out when you’re using the other.
"The onset of dementia is usually later in bilingual individuals‚ but a number of other experiences may postpone dementia‚ such as doing crosswords‚ having a rich social life and exercising.
"However‚ there isn’t a lot of research on this topic in the South African context, and it is not yet known which of these experiences is the most efficient."
Said Ansaldo: "Having more centralised and specialised functional connections saves resources compared to the multiple and more diverse brain areas allocated by monolinguals to accomplish the same task."
His research follows findings last year that toddlers who switch between languages develop better creative problem-solving skills than children who can speak only one language. This is because using two languages makes the brain more flexible.
According to the 2011 census‚ about 2.2-million people in South Africa have some form of dementia.
Alzheimer’s South Africa said there were an estimated 44.4-million people with dementia worldwide in 2013‚ and dementia sufferers were expected to rise to 75.6-million in 2030 and 135.5-million in 2050.
The South African Medical Journal said little was known about the incidence of dementia in low and middle-income countries such as South Africa.