Douglas_Knight comments on [Link] Valproic acid, a drug for brain plasticity - Less Wrong
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I am not sure it's false, that may depend on how do you define "children".
I personally know a couple of kids who were forced to learn a different language around the ages of 4-5. The process went much faster and easier than with adults.
No, it doesn't depend on how you define "children." People get continually better at learning second languages, up at least to age 16. For every aspect of language (except accent) that people have measured, older people learn faster. Forget your anecdotes and read the literature.
If you're appealing to the literature, it would be good form to provide references.
Would this include humans less than four years of age?
I've only seen one study that included 3 year-olds. And it didn't include many, so it didn't break them out and only concluded that the range of 3-5 did worse than 6-7.