Earlier quoted context omitted.
> Classes with other students are just about the least effective way to learn a foreign language. Well, sure a private tutor is better, but that's a lot more expensive. Without a teacher of some sort that can provide feedback, I have no idea how I could have learned elementary Mandarin (that is produce and listen to sounds radically different from my native English). From what I've seen the ability for computers to g…
> Without a teacher of some sort that can provide feedback, I have no idea how I could have learned elementary Mandarin One of the points made in The Language Instinct is that children pick up their languages without using any explicit feedback. That is, people in the child's life who can already speak are liable to ignore errors in the child's speech, and when they do point out errors, the child will essentially alw…
The issue is that it is very difficult for adults to learn new phonemes (individual units of sound that distinguish words from each other) - an adult hearing a novel phoneme tends to map it to one existing in their native language.
Children however aren't handicapped by this problem -- they actually learn the phonemes of their language before they understand the words.
In the Mandarin context, this means it is difficult to learn the ü sound - it just is perceived as something like "u" (resulting in inability to distinguish lü from lu). Tones are another category, where it is just plain hard for adults to distinguish words by tonality. Needless to say, production of the novel sounds is also incredibly hard.
Point being - it's difficult to bridge this gap - and I'd imagine near impossible for most without a teacher. I find Pimsleur's claim of learning a language "effortlessly" with a "near-native accent" - with only the aid of a CD - absurd in this context.
A source that goes into this: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2846316/