Recent studies show that infants can master two languages with the same ease as their monolingual peers. European researchers have applied sophisticated neuroscience to see if bilingual toddlers really have it that easy.
Previous studies suggest that the challenging task of associating two words with one object led to a delay in processing as a result of the higher cognitive load. As more recent studies have overturned this theory, the INFANTBILINGUALBRAIN (Language learning in monolingual and bilingual infants: evidence from electrophysiological and optical signals) project has investigated how bi- and mono-lingual infants learn their languages and which area of the brain they use.
Further details: Language learning in infants under analysis