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high reactivity and introversion. Now

we’re about to see its greedy side.

The old brain, according to Dorn, is

constantly telling us, “Yes, yes, yes! Eat

more, drink more, have more sex, take

lots of risk, go for all the gusto you can

get, and above all, do not think!” The

reward-seeking, pleasure-loving part of

the old brain is what Dorn believes

spurred Alan to treat his life savings

like chips at the casino.

We also have a “new brain” called

the neocortex, which evolved many

thousands of years after the limbic system.

The new brain is responsible for

thinking, planning, language, and

decision-making—some of the very faculties

that make us human. Although

the new brain also plays a significant

role in our emotional lives, it’s the seat

of rationality. Its job, according to

Dorn, includes saying, “No, no, no!

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