Pearl and Lambert were the first to test only “balanced” bilinguals—that is, a child who is completely fluent in two languages and feel that neither is their “native” language because they grasp the two so perfectly.
Pearl e Lambert foron os primeiros en estudar os bilingües “equilibrados”, o que quere dicir que un neno é competente nas dúas linguas e sente que ningunha delas é “nativa” porque entenden perfectamente as dúas.