The cognitive tests developed by Western neuroscientist Adrian Owen and his team have been used in hundreds of scientific studies to identify deficits and differences between various clinical and healthy populations. Our prediction was that if bilingualism provided a general cognitive advantage, then we would be able to see it – and we didn’t,” Nichols said. “We explored many different ways of comparing the two groups across a broad range of cognitive tasks. Nichols says many previous research studies have suggested that the ‘bilingual advantage’ is real, although they tend to use small samples and focus on very specific tests that might not generalize. Surprisingly, there were no consistent differences between them on any of our cognitive tests,” explains Emily Nichols, a Faculty of Education postdoctoral scholar in the Developing Brain Lab and lead author of the study. “From our 11,000 participants, we generated two very carefully matched groups – one monolingual and one bilingual. The study, Bilingualism Affords No General Cognitive Advantages: A Population Study of Executive Function in 11,000 People, was published Monday in the journal Psychological Science. The results showed no evidence that the benefits of being bilingual transfer to other mental skills. Each person also reported whether they spoke one language or more, and which languages they spoke. More than 11,000 participants from around the world completed 12 online cognitive tests that taxed reasoning, memory, planning, visuospatial skills and attention. Despite numerous social, employment, and lifestyle benefits, speaking more than one language does not improve your general mental ability, according to a new study by Western’s Brain and Mind Institute.