Being bilingual can be bad for your brain: Scientists say it can damage a person's ability to judge their own performance

More than half of the world's population is bilingual and that prevalence is rising. Psychologists have been interested in how bilingualism shapes the mind for almost a century - and many say it can improve memory and attention. But new research suggests this may not be the case, and being bilingual could in fact be bad for your brain. In their studies, babies listened to words spoken in both Spanish and English, which is common in America. They are those who suggest that in order to speak in one language, bilinguals have to suppress the influence of the other.