下面论文中的实验表明语言学习的interaction起到了至关重要的左右，没有互动听录音还是看视频效果都打打折扣，
所以鼓励大家和孩子说英文，不仅仅是读故事，要由interaction，有互动，你来我网，这样孩子对语言的理解和习得会更好。
另外不要担心自己发音不准会误导孩子，因为孩子听歌曲，录音还是视频都比你互动的时间都多，再加上孩子大脑本身就有correction的机制，不会被你带跑的。就像爷爷奶奶用半土不洋的普通话和孩子说话，孩子听的懂，但是发音不会和爷爷奶奶一样不准。仅供参考。
Abstract:
Infants acquire language with remarkable speed, although little is known about the mechanisms that underlie the acquisition process. Studies of the phonetic units of language have shown that early in life, infants are capable of discerning differences among the phonetic units of all languages, including native- and foreign-language sounds. Between 6 and 12 mo of age, the ability to discriminate foreign-language phonetic units sharply declines. In two studies, we investigate the necessary and sufficient conditions for reversing this decline in foreign-language phonetic perception. In Experiment 1, 9-mo-old American infants were exposed to native Mandarin Chinese speakers in 12 laboratory sessions. A control group also participated in 12 language sessions but heard only English. Subsequent tests of Mandarin speech perception demonstrated that exposure to Mandarin reversed the decline seen in the English control group. In Experiment 2, infants were exposed to the same foreign-language speakers and materials via audiovisual or audio-only recordings. The results demonstrated that exposure to recorded Mandarin, without interpersonal interaction, had no effect. Between 9 and 10 mo of age, infants show phonetic learning from live, but not prerecorded, exposure to a foreign language, suggesting a learning process that does not require long-term listening and is enhanced by social interaction.
全文
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC166444/
