Research brief: Bilingual brains keep old age at bay

Learning a second language may help prevent the onset of Alzheimer's disease, according to a Canadian psychologist. Dr Ellen Bialystok, from York University in Toronto, carried out a computer reaction time test on 104 people between the ages of 30 and 88. Those who were bilingual had better reaction times and responded to rule changes more quickly than those who spoke only one language (www.yorku.ca).

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