The Power of Habit that scientists at MIT have, in essence, mapped the habit genome. What they’ve found is that the nucleus of a habit is made up of a neurological loop, which has three parts. It begins with a cue that sends the message to the brain to switch on the automatic mode. Next comes the routine—what we think of as the habit itself, which can be psychological, emotional, or physical. And last is the reward, the cue that tells the brain to reinforce this process. This is the “habit loop,” and it’s easy to see why as time goes on it becomes more and more automatic, more and more
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