[dragonwriter]

So we've not only confirmed that children have an advantage, but we've identified the nature of the advantage: it's easier for them to muster both interest and effort, to the extent that this outweighs the disadvantages they have outside of those areas.

[garmaine]

Yeah but there’s nothing physiological or neurological there, which is what the critical period hypothesis is predicting. It’s just the reality of childhood in an immersion environment.

[dragonwriter]

> Yeah but there’s nothing physiological or neurological there

That's, IMO, an unwarranted (and, taken strictly, almost implausible) assumption. (Especially on the interest side.)