嗅出你的壓力 狗狗行為大不同 Stressed Out? So Is Your Dog

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狗狗的鼻子非常靈敏。牠們甚至可以察覺到人類汗水和呼吸中皮質醇濃度的變化。

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　　Dogs’ noses are incredibly keen. They can even detect changes in cortisol levels in human sweat and breath. Known as the “stress hormone,” cortisol increases when humans are under pressure. Recent research indicates that the smell of human stress can influence a dog’s behavior and emotions.

　　In the study, human volunteers were exposed to the stressful tasks of preparing and delivering a speech on the spot and then solving math problems. __1__ Researchers collected sweat and breath samples from the volunteers on pieces of cloth during both their stressful and restful states.

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