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Kahneman believes that there are two different ways in which the human brain
thinks about knowing and two different ways it thinks about coherence. He
termed these System 1 and System 2. Both systems are needed but each has
a different role to play.

System 1


Effortless. System 1 thinking is automatic. It sense makes through past
experience. This means it is the fastest system. But because it makes judgements
based on quick conclusions it can be unreliable.

System 2


Effortful. Using system 2 requires deliberate thinking. But system 2 is also slow
and because of this lazy. Our brains prefer to go with the law of least effort and
so often relinquish thinking control to system 1.

Neuro-Science – system 1 and system 2

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