...Much of Professor Kahneman's work is grounded in the notion — which he did not originate but organized and advanced — that the mind operates in two modes: fast and intuitive (mental activities that we're more or less born with, called System One), or slow and analytical, a more complex mode involving experience and requiring effort (System Two).
Others have personified these mental modes as Econs (rational, analytical people) and Humans (emotional, impulsive and prone to exhibit unconscious mental biases and an unwise reliance on dubious rules of thumb). Professor Kahneman and Professor Tversky used the word "heuristics" to describe these rules of thumb. One is the "halo effect," where in observing a positive attribute of another person one perceives other strengths that aren't really there.
"Before Kahneman and Tversky, people who thought about social problems and human behavior tended to assume that we are mostly rational agents," the Times columnist David Brooks wrote in 2011. "They assumed that people have control over the most important parts of their own thinking. They assumed that people are basically sensible utility-maximizers, and that when they depart from reason it's because some passion like fear or love has distorted their judgment."
But Professors Kahneman and Tversky, he went on, "yielded a different vision of human nature."
As Mr. Brooks described it: "We are players in a game we don't understand. Most of our own thinking is below awareness." He added: "Our biases frequently cause us to want the wrong things. Our perceptions and memories are slippery, especially about our own mental states. Our free will is bounded. We have much less control over ourselves than we thought."
The work of Professor Kahneman and Professor Tversky, he concluded, "will be remembered hundreds of years from now."
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