The two biggest barriers to good decision making are your ego and your blind spots. Together, they make it difficult for you to objectively see what is true about you and your circumstances and to make the best possible decisions by getting the most out of others. If you can understand how the machine that is the human brain works, you can understand why these barriers exist and how to adjust your behavior to make yourself happier, more effective, and better at interacting with others.

Understand your ego barrier. When I refer to your “ego barrier,” I’m referring to your subliminal defense mechanisms that make it hard for you to accept your mistakes and weaknesses. Your deepest-seated needs and fears—such as the need to be loved and the fear of losing love, the need to survive and the fear of not surviving, the need to be important and the fear of not mattering—reside in primitive parts of your brain such as the amygdala, which are structures in your temporal lobe that process emotions. Because these areas of your brain are not accessible to your conscious awareness, it is virtually impossible for you to understand what they want and how they control you. They oversimplify things and react instinctively. They crave praise and respond to criticism as an attack, even when the higher-level parts of the brain understand that constructive criticism is good for you. They make you defensive, especially when it comes to the subject of how good you are.

At the same time, higher-level consciousness resides in your neocortex, more specifically in the part called the prefrontal cortex. This is the most distinctively human feature of your brain; relative to the rest of the brain, it’s larger in humans than in most other species. This is where you experience the conscious awareness of decision making (the so-called “executive function”), as well as the application of logic and reasoning.
