Jad and the team at Radiolab have just released a new show, called Words. I talked to them about the role of language in the development of children's thinking. You can listen to the podcast here. And you really should check out the accompanying video as well.
Quite a few things came out of the discussion which I wanted to comment on some more. So I have written a post on my PT blog to explain in more detail how I see things working here. The post is called "What do we mean by 'thinking'?", and you can check it out here.