Just finished watching a very very interesting video of a speech by Patricia Kuhl, who’s the Endowed Chair for Early Childhood Learning at the University of Washington. (thanks to Cris mother of G and GG for bringing it to my attention!)
http://www.youtube.com/watch?v=Fcb8nT0QC6o
It’s a long video, and I took notes, see further below.
I will just highlight some of the key points in this video:
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The critical period for language learning begins from after 7 months of age. From this time onwards, the ability to distinguish between sounds starts to decline if exposure is not there. You can already see a significant decline from 7 months to 12 months in the ability of babies to distinguish foreign language sounds where the babies are not exposed to those sounds.
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The reason for this is that the baby starts to take stats of what they hear, and their neurons start to gear themselves to what they are hearing. This is basically the “use it or lose it” principle.
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With just 12 sessions of 25 minutes each during this time period where babies are exposed to the foreign language, the language ability of that baby was found to be NO DIFFERENT compared with a baby who was in the foreign country!
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Exposing babies to just foreign language videos or audio tapes MAKE NO DIFFERENCE (ie., they do not work!). The key is INTERACTION. The degree of interaction seems to determine how much the baby’s brain decides to pay attention to (or take stats of) the foreign language that is being heard.
NOTES:
6m:40s - start of talk by Patricia Kuhl
14.45 - Graph shows critical period for acquisition of language. Starts to decline from around 7.
Neural network starts to get committed to a particular language or languages early on, and becomes an interference to other languages later on.
22:00 - Up to 6 months of age, babies are “citizens of the world” - can distinguish between sounds of any language. Soon after, ability to distinguish diminishes rapidly.
Babies takes statistics and do analysis on what they hear, and fine-tunes their ability to distinguish based on what they hear the most. Gives example of how a Japanese baby starts to lose ability to distinguish between ‘l’ and ‘r’ compared with an American baby.
34 mins - Chart shows relationship between native and foreign language learning.
“As you map your brain for English, you’re giving up Japanese and French unless you are being exposed to it. It’s the learning itself that changes the brain that causes this decline in foreign language abilities.”
First discovery: Children who are advancing faster on native language abilities are also declining faster on foreign language abilities.
Second discovery:
35 mins - charts show that babies who had better native speech sound perception at 7.5 months had better language abilities at 24 months (could produce more words, language complexity, length of sentences). Better perception leads to faster language growth.
However, based on first discovery, they also found that this has the opposite effect on foreign language ability (because babies had been committing themselves earlier to the native language).
38 mins - exposed American babies to mandarin sounds between the critical period of 7-9 months - just 12 sessions, 25 minutes each, 4 different talkers, about 33,000 syllables. Result was that those American babies were statistically identically to the Taiwanese babies.
43 mins - did test to see whether babies can learn from just TV or audio tapes playing foreign language content. Audio - absolutely no effect. TV also none! Social interaction is key! The social brain determines when it’s worth taking language statistics.
46 mins - Studies also showing that the degree of interaction also determines degree of increase of language ability. Also found that the 12 sessions of exposure improved babies’ cognitive skills.