NYT: How Immersion Helps to Learn a Language "After five months, both groups retained the language even though they had not used it at all, and both displayed brain processing similar to that of a native speaker. But the immersion group displayed the full brain patterns of a native speaker, Dr. Ullman said."
Language: In the image above you see the Australian Sign language alphabet. In Australia they have a sign language called Auslan. which is the main language to about 6500 deaf people. Most people in Australia are bilingual which means they can speak two languages.