Lulu Miller

And not just kind of any old sound, but the sounds that are really important to us as human beings.

And in particular, how does the brain make sense of the sounds that our ears detect?

Sounds such as?

A voice.

And in particular?

A very special voice.

Mom's voice.

Okay, that sounds icky.

Well, it's certainly a loaded term, right?

But Daniel's basically like, a mother's voice is one of the first voices that you hear in your life.

And studies have shown that children are actually able to recognize their mother's voice before they're even born.

So like, in the womb, right around 18 weeks, ears...

poke out of the side of the head of a fetus.

And researchers have done studies showing that when the fetus hears the voice of the person who's carrying it, its heart rate starts going way faster.

And it's kind of inferred that the fetus can recognize what we're calling mother's voice from other voices.

What is the beating heart?

Sorry, go ahead.

Oh, sorry.

Why would a heart beat faster?

You know, I mean, I guess it's... Anxiety.