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"He proposes a model of intuitive thinking “that can accommodate both its flaws and its marvels,” he said. There are two basic families of thought processes: 1) intuition and 2) reasoning. The former is fast, automatic, parallel, effortless, associative, slow-learning and emotional. The latter is slow (in the ruminative sense), serial, controlled, effortful, rule-governed, flexible and (emotionally) neutral. “Basically, we run on system 1,” Kahneman said. “We don’t work very hard.” The appeal of this mode is that it’s “unproblematic, skilled and adequately successful…One physiological sign that the mind is working hard is that the pupils dilate, and I don’t see many pupils dilating out there in the audience,” he quipped. How do you tell if you’re in system 2 versus system 1? Kahneman posited an “effort diagnostic.” You’re definitely in system 2 if interruption by a concurrent activity — say someone practicing trumpet while you’re trying to read the paper — proves irritating."
