Does Being Bilingual Make You Smarter?

Speaking two or more languages has long been associated with cognitive benefits. But does bilingualism actually raise IQ, or is the relationship more nuanced?

The Bilingual Advantage

Research by Ellen Bialystok and others found that bilingual individuals consistently outperform monolinguals on tasks requiring executive function — specifically the ability to switch between tasks, ignore irrelevant information, and hold multiple concepts in mind simultaneously.

This "bilingual advantage" appears because managing two languages constantly exercises the brain's executive control system. Bilinguals must constantly suppress one language while using the other, giving their executive function a daily workout.

Does It Raise IQ Scores?

The evidence on IQ scores specifically is mixed. Some studies show small advantages on verbal and nonverbal IQ measures. Others show no overall IQ difference but specific advantages in attention, cognitive flexibility, and task switching.

The Dementia Delay Effect

Perhaps the most striking finding: bilingualism delays the onset of Alzheimer's disease by an average of 4-5 years compared to monolinguals, even after controlling for education and other factors. The cognitive reserve built by managing two languages appears to protect the brain against age-related decline.

Should You Learn a Second Language?

Absolutely. The cognitive, cultural, and career benefits are substantial. And modern research confirms: the brain benefits are real, even if the IQ boost is modest.