In classic experiments on stress, people performed tasks that required concentration, like solving puzzles, while being blasted at random intervals with uncomfortably loud sounds. They started sweating and their heart rates and blood pressure climbed. They struggled to focus and made mistakes. Many got so frustrated that they gave up. Searching for a way to reduce anxiety, researchers gave some of the participants an escape. If the noise became too unpleasant, they could press a button and make it stop. Sure enough, the button allowed them to stay calmer, make fewer mistakes, and show less
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