Paul D. MacLean

Like, where-when did that originate? When did we start using that? And so I asked Siri AI, "What does the term lizard brain, uh, come from?" And so it talked about the triune brain theory from this scientist, uh, back from in the 1960s.

Paul MacLean gave me, like, the three bullet points of, like, what is the lizard brain, uh, three-part thing, and also that, like, modern neuroscience has largely debunked the triune brain theory [laughs] and gave me some articles to that.

And so for that kind of world general knowledge, I've really been enjoying, uh, Siri AI, and also just for adding a bunch of events to my calendar that I might see on my screen.

Really good at that, we'll just say.

What is happening under the hood when I decide to snap at a colleague or when I decide to patiently listen?

The most effective model to understand this is Paul McLean's concept of the triune brain.

Now, it is a slightly simplified model, but incredibly useful for practical application.

It divides the brain into three functional layers that evolved over time.