The Reptilian Brain
Your "3-Brains-in-One" Brain
Actually, you already know this from your experience: for example, remember a time when you really wanted to do something, but you knew you shouldn't? The most illogical or irrational "wants" we have probably derive from older parts of our brain, while the understanding of smart versus dumb choices comes from the newest part. If that idea offends you, or seems just too "Western" or "scientific", you might take a "de-tour" for a moment and read this essay on science.
Take another example: you can be hungry, but not feel it until you pay attention to it; then when you do notice, you realize you've been getting hungrier for a long time. Hunger comes from the most basic parts of our brain, but our awareness of it is controlled by the newest part. Here are the "3 brains":
||Center of the Brain
|"limbic system" or
"old mammalian brain"
(Wrapped around Brain Two!)
This is the brain we share with birds, and reptiles. Think of it as the "housekeeping brain". Just the basics: hunger, temperature control, fight-or-flight fear responses, defending territory, keeping safe -- that kind of thing. The structures that perform these functions within our brain are extremely similar to those in the brains of reptiles. Thus, this brain is called the "R complex" (R for reptilian). You can take a Tour of the R complex when you wish; and you will see parts of it in the section on obsessions.
As animals became more complex, other structures were added around the R complex in a shell, or "girdle". The Latin word for arc or girdle is "limbus", and this brain is called the "limbic system". We humans share this brain with older mammals like dogs, cats, and horses, and even mice (as opposed to newer mammals like chimps; we'll get to them in a moment). Their brains, and this part of our brains, are extremely similar.
Think about the difference between a mouse and a lizard, or between a cat and a snake, and you'll recognize what this mammalian brain adds to a creature's capacities. Mammals have "feelings" like ours. We'll be looking at the structures of the limbic system in the sections on mood, memory, and hormone control. The main parts of the limbic system (except the thalamus, which is generally regarded as part of Brain One) are shown below. By taking all the Brain Tours you'll see each of these parts and get a better sense of how this set of structures is positioned underneath the cortex.
Here is the familiar "cortex" you can see from the outside. With this brain, primates can do things that horses and cows cannot, like complex social interactions and advance planning (such as planning an attack on a neighboring troop). In humans the cortex has grown to a huge size, somehow in association with our development of language. Other primates like chimpanzees, or monkeys, have much less cortex, which is surprising since chimpanzee DNA differs from ours by only 1.6%! (stunning, really; I hope you're stunned.
Recently some technical issues have arisen with this number, but for now, it's still generally regarded as, well, amazing!). If you wonder why we humans have populated the entire globe, while our chimp relatives are stuck in a shrinking rain forest with their nearly identical DNA -- read The Third Chimpanzee, by Jared Diamond. You've got a great question, and his is a great answer. (Similarly, if you wonder why white-skinned humans seem to have an unfair share of the resources and money, his other masterpiece offers a solid explanation beside skin color: Guns, Germs, and Steel).
Three Brains in One
To keep all this straight, think of the following image (ok, it's a little odd, but it seems to work). The R brain is like a golf club. Let's make it a driver, one of those with a big fat wooden head. Hold the club so that the head is at the top. There's your R complex, with your spine sticking down toward the ground. The R brain is just a big swelling at the top of a spinal cord, and that's how it developed. Worms have little swellings, snakes have bigger ones. OK so far?
Next we'll add the layer that makes mammals behave so differently from reptiles. This next "layer", the old mammalian brain, evolved on top of the R complex. It was not a remodel so much as an addition, like adding on bedrooms all the way around a kitchen/bathroom. This addition covers the entire R complex, leaving the R complex deep within the brain. In our model, take the golf club, and cover the head with a sock; a big thick red one would be nice. Now you have the R brain (golf club), with the old mammalian brain wrapped around it (sock). Notice that the red sock forms a shell, or continuous border around the golf club head.
To complete the brain picture, add a bicycle or hockey helmet on top of your red-socked golf club head: that's the newest mammalian addition, the "cortex", and it is the grey squiggly stuff you can see on the outside.
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