With the amount of bilinguals increasing worldwide, psycholinguists have begun to look at how the brain represents multiple languages.
Research during past decades shows that bilingual brains have special neural connections.
[3] After this step, children increase their vocabulary in categories like colour, animals, or food, and learn to add prefixes and suffixes to and meaning to words.
Also in this step of learning words, the vocabulary size positively related to the exposure time in that language.
This is different from how they learned their first language which involves inputting the information of semantic and formal entities together.
[2] With years of researches, how languages are stored and processed by bilinguals is still a main theme that many psycholinguists.
[5] Reaction time of recognizing words in different languages is the most used method to figure out how our lexicon been activated.
Imaging studies have yielded that specific brain areas are involved in bilingual switching, which means this part of the brain can be said as the "third lexicon", the interconnected part of two lexicons for each language, where stores the guest words.