We Think of Ourselves as Rational

In Daniel Kahneman’s book Thinking Fast and Slow, Kahneman lays out two ideas for thinking about our thought processing. Kahneman calles the two ways of thinking about our thought processing System 1 and System 2. System 1 is fast, automatic, often subconscious, and usually pretty accurate in terms of making quick judgments, assumptions, and estimations of the world. System 2 is where our heavy duty thinking takes place. It is where we crunch through math problems, where our rational problem-solving part of the brain is in action, and its the system that uses a lot of energy to help us remember important information and understand the world.


Despite the fact that we normally operate on System 1, that is not the part of our brain that we think of as ourselves. Kahneman writes, “When we think of ourselves, we identify with System 2, the conscious, reasoning self that has beliefs, makes choices, and decides what to think about and what to do.” We believe ourselves to be rational agents, responding reasonably to the world around us. We see ourselves a free from bias, as logically coherent, and as considerate and understanding. Naturally, it is System 2 that we see ourselves as spending most of our time with, however, this is not exactly the case.


A lot of our actions are influenced by factors that seem to play more at the System 1 level than the System 2 level. If you are extra tired, if you are hungry, or if you feel insulted by someone close to you, then you probably won’t be thinking as rationally and reasonably as you would expect. You are likely going to operate on System 1, making sometimes faulty assumptions on incomplete data about the world around you. If you are hungry or tired enough, you will effectively be operating on auto-pilot, letting System 1 take over as you move about the cabin.


Even though we often operate on System 1, we feel as though we operate on System 2 because the part of us that thinks back to how we behaved, the part of us required for serious reflection, is part of System 2. It is critical, thoughtful, and takes its time generating logically coherent answers. System 1 is quick and automatic, so we don’t even notice when it is in control. When we think about who we are, why we did something, and what kind of person we aspire to be, it is System 2 that is flying the plane, and it is System 2 that we become aware of, fooling ourselves into believing that System 2 is all we are, that System 2 is what is really in our head. We think of ourselves as rational, but that is only because our irrational System 1 can’t pause to reflect back on itself. We only see the rational part of ourselves, and it is comforting to believe that is really who we are.

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