Things to keep in mind about the two-speed brain: Your deliberate system is responsible for sophisticated functions such as reasoning, self-control, and forward thinking. It excels in handling anything unfamiliar, complex, or abstract. But it has limited capacity and gets tired quickly. When it’s overused, overloaded, or distracted, it’s harder for you to be wise, balanced, or reliable. Your automatic system lightens the load on your deliberate system by automating most of what you do and taking fast shortcuts that filter out “irrelevant” information and options. That’s mostly helpful. But it
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