Thanks Tzadeck for the citation. I had a feeling that experiment sounded a bit familiar. I've seen her TED talk.
Tzadeck Wrote:In the next 2-4 months babies stop being able to do this. They get about 15 percent better at distinguishing between similar sounds in their own language, and 15 percent worse at distinguishing between sounds that are not in their language.
That sounds like the babies are worse at learning if you ask me. As I get better at distinguishing sounds in a new language after several months of listening, I don't rapidly lose my ability to distinguish the sounds in other languages. Honestly why is this even startling? When babies start focusing their learning down one channel, they get better it at that task, but worse at the task they don't focus on. The same study then goes on to say that american babies were just as good at distinguishing sounds in mandarin as Taiwanese babies (who had been learning for 10 months) after just 12 sessions of mandarin exposure. In other words, the babies got better at the task again after spending some time on it. Just like adults!
Tzadeck Wrote:Adults can't mimic this at all. As an adult you don't have some magic period where you can distinguish between all sounds with 65% accuracy [the value from one of the studies], and then gradually get better at the important ones and worse at the others.
I know this is going to seem like like an unreasonable quibble, but honestly 65% doesn't seem all that magical to be honest. Even if I couldn't necessarily produce the sounds accurately at first, if you played me the mandarin 'q' and then 'ch' or played two syllables in different tones, I'm pretty sure I'd at least hear the difference 65% of the time. Heck I've done similar things in class with japanese 12 year olds (beyond critical period). They can hear the difference between the similar english sounds (r/l, b/v etc) pretty accurately when said in random sequences using a similar test. There's actually an exercise which you (Tzadeck) may be aware of where students progress down a branching pyramid structure, turning left or right based on listening to similar sounding english words.
The case of 'feral' children would seem to demonstrate that it is the exposure and time that is the key ingredient for language acquisition, as these children tend to have severely stunted language development due to the isolation. Just being children isn't enough.
re: a previous post
Tzadeck Wrote:The way science generally works is not by creating those kinds of perfect studies. Perfect studies are almost always impossible. So what we have to do is make studies that are indirect but are clever and can nevertheless get to the heart of what we are trying to figure out.
I get that perfect studies are impossibly impractical, so I get what you're saying. But I think many of the language studies I've read about are based on flawed assumptions or odd interpretation of the results. Usually they take one small isolated component of language learning (say memorising a set of vocabulary) over a period of a few weeks or month, sometimes just a few days or hour, and then make sweeping generalisations. There are few studies that track learners all the way to fluency, and truly log things like time on task.
Anecdotally, I think most adult learners who are able to spend just an hour a day for five years getting level appropriate comprehensable input via immersion, course or whatever else will end up able to speak quite well
and be literate despite spending well less than half the time on task as the average 5 year old native kid. People who've been at it 10 years or more, or devoted more time to it daily show more progress.
Edited: 2012-02-20, 9:57 am