Dr Karl

or most certainly they'll slur because they can't do it yet, but they will.

Normally they get there by 10 or 12.

So I have a brain defect, which is that I will very confidently say the wrong word and I can be reading off a script or an autocue, and if my producer here at the ABC is not paying attention, instead of saying, the environment has changed, blah, blah, blah, and I will say very confidently, the elephant has changed, and I'll put it totally confidently and...

I don't – I had no record of saying that and it happens.

So trying to speak is really, really complicated and it's amazing that we can do it as well as we do and that's a very poor explanation of why we make mistakes.

It's admitting that we do but why you juggle up different things –

It's such a complicated activity because you've got to use so many things in your airways and that's part of the reason that many people, 1% to 5% of the population, will poke their tongue out to disable their tongue when they're doing a complicated activity so they're not using up extra processor cycles from their brain.

If they're trying to, for example, like Shane Warne, spin a ball from the past because he was brilliant at that, or like a basketballer, they'll poke their tongue out and immobilise it with their lips or tongue.

And so your tongue is using up just so much energy and processes cycles.

I know that's a weak explanation and it's not surprising you make mistakes.

I don't have a better explanation than that.

No, we really need a neurolinguistic person to talk to us.

Thank you, Dr. Bex.

Yeah, Dr. William, come on down.

There was a case of two athletes who got married and they had a baby who had muscles at the age of three.

Crazy.

Muscles at three.

Will that pass on?

We don't know.

Secondly, evolution is fairly slow because you've got to have it consistently happening over a large number of people and generations.