I've had some guests on over the past few months talking about the close relationship between the human language ability and the nature of human consciousness, and I wondered what you thought from observing late-talking children. My sense from your book is that you didn't notice any apparent difference in their mentality, even though they weren't talking. And, of course, they eventually go on to be very normal speakers, indistinguishable from others. There is no evidence that their speech as adults is different from the speech of other people. Nor is there any stereotyped personality type.
Late talkers vary enormously.
Meanwhile, let's continue our conversation. Any answer to that would be in the realm of speculation. I have, however, discovered striking patterns among these children and their parents. They also tend to be late in toilet training. Yes, I noted the late toilet-training connection in your book.