Berk and others had already shown that actually watching a funny video, or just laughing at a joke, could make healthful changes in the levels of hormones involved in stress and lower blood pressure.

• 伯克和他的助手已经证实，观看一部有趣的电影，或者是听到一则令人捧腹的笑话而开怀大笑都能促使体内有关压力的荷尔蒙含量得到有效控制并降低血压。