Language is a uniquely human skill. That’s why studying how people learn and use language is crucial to understanding what it means to be human. Given that most people in the world – an estimated 60% – are multilingual, meaning that they know and use more than one language, a researcher who aims to understand language must also grasp how individuals acquire and use multiple languages.
The ubiquity of multilingualism also has practical consequences. For example, in the early schooling years, children learn more effectively when they are taught in their mother tongue rather than a second or third language. Research also shows that people make different decisions depending on whether they are thinking in their first or second language.
