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By Robin Young PREVIEW Columnist Those giggles and guffaws can seem like just silly throwaways. But laughter, in response to funny events, actually takes a lot of work because it activates many areas of the brain: areas that control motor, emotional, cognitive and social processing. Researchers now appreciate laughter’s power to enhance physical and mental well-being. Laughter’s physical power  People begin laughing in infancy, when it helps develop muscles and upper body strength. Laughter is not just breathing. It relies on complex combinations of facial muscles, often involving movement of the eyes, head and shoulders. Laughter doing it or observing it activates multiple regions of the brain: the motor cortex, which controls muscles; the frontal lobe, which helps you understand context; and the limbic system, which modulates positive emotions. Turning all these circuits on strengthens neural connections and helps a healthy brain coordinate its activity.

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