concepts
It is not uncommon for persons unfamiliar with linguistics to suggest that the brain and speech mechanisms of children probably function better when they are unencumbered by more than one language. In this view, it is assumed that to avoid confusion, developing one language at a time is preferable to using two or more languages concurrently, especially in school classrooms. [Source: Encyclopedia of Bilingual Education; Container Theory of Language]
container theory of language
languages and linguistics