Researchers found that this phenomenon primarily deals with the memory network of an individual. Once a memory network is organized, it is difficult for the brain to reorganize information contrary to the initial information, because the previous information was processed first. This phenomenon becomes a struggle for adults who are trying to learn a different language. Once an individual has learned a language fluently, they will be heavily influenced by the grammatical rules and pronunciations of their first language they learned, while learning a new language.