- The triune brain theory explained with visuals and the influence percentage of each one in human decision-making:
Neocortex brain (Rational).
Limbic brain (Irrational).
Reptilian brain (Irrational).
- 4 conclusions
We (as humans) don’t know as much as we want about how the brain works, but we do know it's one of the most complex organs and probably one of the most studied.
Furthermore, what most people don't know is that there's more than one theory out there that attempts to explain how it works.
A couple of years ago, I came across the "triune brain theory." A famous thesis used to conceptualize brain functioning that has been widely used to support the neuromarketing approach and similar disciplines.
This thesis is an evolutionary theory of brain development proposed by Paul D. MacLean back in the 1960s and then published in his book The Triune Brain in Evolution.
The idea is that the brain can be divided into the Neocortex (Rational Brain), the Limbic, and the Reptilian (both Irrational Brains).
The second part of the theory implies that the evolution of these three segments has followed an inside-out pattern. Think of it like layers of your brain that have grown one over the other. These parts also have different roles and percentages in the decision-making of human behavior.
Is responsible for our primitive responses to stress. When the reptilian brain detects a threat, it immediately releases hormones via a neural signaling cascade, ultimately releasing adrenaline and activating our muscles for fight or flight.
I bet you just felt goosebumps seeing the snake!
That's your irrational brain reacting
Is responsible for emotion. One way it does this is by activating centers of trust that release oxytocin and bonding hormones while simultaneously inhibiting fear centers via endorphins that are released through physical touch.
Did you just “Aww” when you saw the puppy?
I’m reading your mind! LOL
That's your emotional brain feeling.
It deals with higher-order thinking and cognition. You use your neocortex when you try to solve a complex mental problem using rational thought processes.
Did you read the ones that you know about the language?
That's your rational brain responding.
Notice the words you don't know are just “meaningless” pictographs
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