Advertisement

2. Duchenne Smile

Guillaume Duchenne, another nineteenth-century scientist, studied the physiology of facial expressions. The Duchenne smile combines the use of the zygomatic major and the orbicularis oculi muscles to produce a genuine smile. The zygomatic major raises the muscles at the corner of the mouth, and because they are voluntary, they can be used to convey a fake or forced smile. The orbicularis oculi, however, are involuntary. They raise the cheeks and produce crows feet around the eyes during an authentic Duchenne smile.

Duchenne-smile orbicularis-oculi zygomatic-major fake-smile genuine-smile ilbusca / Getty Images
Advertisement

More on Facty Health

Disclaimer

This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.