Future studies should distinguish between languages learned in childhood and those learned in old age. I believe both are effective, but this still needs to be proven,” said Berlit.
I wonder if when a child learns many languages during childhood, the brain treats the communicative systems as all a unified mechanism, as if it if was one whole language composed of several words that are synonyms and antonyms in the semantic spectrum. Under this logic, the benefit would be for adult learners who then would consider different languages as different communicative systems, therefore locating them in different regions of the brain and ultimately enhacing neuroplasticity and synapses.