There's one key flaw in those studies, at least in my opinion. It's that they were done among children who had no choice. I can't imagine that someone who was a

There's one key flaw in those studies, at least in my opinion. It's that they were done among children who had no choice. I can't imagine that someone who was actually interested and motivated to learn French would get the benefit from Esperanto. I also don't think that the benefit is all that great, and would like to see the studies repeated now, 100-years later.