Nobel Prize-winning author and psychologist Daniel Kahneman lays out the case for two systems of thinking in humans in his book Thinking, Fast and Slow. “System 1” is fast. It’s the system that reacts automatically to noise. It lets you drive without much conscious thought and answer simple questions by rote. “System 2” thinking is more deliberate. It’s the system you use to analyze data and methodically think through a problem.
The main function of System 1 is to maintain and update a model of your personal world, which represents what is normal in it.
Daniel Kahneman
These two systems interact with each other constantly. You can focus on a task using “System 2,” become tired and distracted and then find yourself doing a “System 1” task without realizing you’ve switched Systems. “System 2” demands more physical and mental resources. When you devote those resources to “System 2” thinking, “System 1” thinking relies more on stereotypes and habit. This is when biases creep into your deliberations. You also become more vulnerable to temptations and consider issues more superficially. “System 1” likes the easy answer, even when it’s not the best.
Book Summary Thinking, Fast and Slow
“Two systems” vie for control of your mind, and “two selves” decide your happiness. Can all four of you ever get along?
Daniel Kahneman Farrar, Straus & Giroux Here are some more ways to think about thinking:
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