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That’s exactly a summary of what it does. To get more jargony: it does impulse control, emotional regulation, long-term planning, gratification postponements, executive function. It’s the part of the brain that attempts to tell you, “You know, this seems like a good idea right now, but trust me, you’ll regret it. Don’t do it.” It’s the most recently evolved part of our brains. Our frontal cortex is proportionately bigger and more complex than that of any other primate. And, most interesting, it’s the last part of the brain to get fully wired up.
The frontal cortex is not fully online until people are, on average, about a quarter century old. It’s boggling, but it also tells you a lot about why adolescents act in adolescent ways; it’s because the frontal cortex isn’t very powerful yet. And that has an interesting implication, which is that if the frontal cortex is the last part of the brain to fully mature, by definition it’s the part least constrained by genes and most shaped by experience.
So the frontal cortex is your moral barometer, if that’s the right metaphor. It’s the Calvinist voice whispering in your head. So, for example, the frontal cortex plays a central role if you’re tempted to lie about something; and if you manage to avoid that temptation, your frontal cortex had something to do with it. But at the same time, if you do decide to lie, your frontal cortex helps you to do so: “Okay, control my voice, don’t make eye contact, don’t let my face do something funny.” That’s a frontal task too. This is a very human, very complicated part of our brains.
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Robert M. Sapolsky