that brings us to the “challenge/skill ratio,” the last of our internal flow triggers, and arguably the most important. The idea behind this trigger is that attention is most engaged (i.e., in the now) when there’s a very specific relationship between the difficulty of a task and our ability to perform that task. If the challenge is too great, fear swamps the system. If the challenge is too easy, we stop paying attention. Flow appears near the emotional midpoint between boredom and anxiety, in what scientists call the flow channel—the spot where the task is hard enough to make us stretch but
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