Why do we laugh when tickled?

It's an involuntary response to an attack. The spots on the body that tend to be most ticklish are the same ones most vulnerable to injury, so when we're tickled, we tuck in to defend ourselves, squirm to escape and laugh. Neuroscientists and evolutionary biologists say our laughter shows our submission.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.