Laura Miller studies the roots of writer's block:
First proposed by two psychologists in 1908, [the principle of Yerkes-Dodson Law] holds that the more "aroused" (i.e., engaged and challenged) a person is by a task, the better he or she performs, up to the point that the arousal becomes anxiety or worry, at which point performance declines. In other words, beyond a certain point, the more difficult a writing task, and the more you think it matters, the more likely you are to become blocked. This may explain why journalists with, say, two deadlines per week almost never get blocked: no individual story ever has to carry that much weight.
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