They found that when you learn a language as a child, as a two-year-old, you learn it with a certain part of your brain, and when you learn a language as an adult — for example, if I wanted to learn Japanese right now — a completely different part of my brain is used.
Descubrieron que, cuando de niño, con 2 años, aprendes un idioma, lo aprendes con una parte de tu cerebro, y cuando lo aprendes de adulto, si, por ejemplo, yo quisiera aprender japonés ahora, el cerebro usa una parte completamente distinta.