Watched an interesting documentary last night. It was about baby's growth with a focus on its brain. It's fairly common that baby can listen any language up to about age 3, but will lose the capability of telling differences of the sound, for example, L and R between English and Japanese. They had a case of monitoring the brain function of 1 month old baby with foreign language. The brain showed the reaction to the sound, off course it doesn't mean the baby can understand the language, but is paying attention, recognizing the sound as an important signal. They had a same test with other aged baby, and such function disappears around the age of 1. Also they had research related to foreign language learning process, how baby from English only speaking family react to Chinese language, conducted by a professor at Washington University. They played the video with a woman speaks Chinese with some toys for 15 min everyday for two weeks, and monitored how much the baby react to Ch