METHODOLOGY: In an experiment that was smile-worthy in its own right, researchers used chopsticks to manipulate the facial muscles of their 169 participants into a neutral expression, a standard smile, or a Duchenne smile. In addition to the chopstick placement, some were explicitly instructed to smile. Then, they were subjected to a series of stress-inducing, multitasking activities, which they struggled to perform while continuing to hold the chopsticks in their mouths. The subjects' heart rates and self-reported stress levels were monitored throughout.
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