The difference between how men and women form their mouths to smile has allowed artificial intelligence (AI) to automatically determine gender by analyzing the underlying muscle movements alone, according to new research by the University of Bradford in the U.K. Although automatic gender recognition is already in existence, current methods analyze static images and compare fixed facial features.

The new study is the first to use the dynamic movement of the smile to automatically distinguish between men and women. For the study, the researchers mapped 49 points on the face, primarily around the eyes, mouth, and down the nose.

They used this information to study how the face changes as we smile caused by the underlying muscle movements. This involves two types of movements: the change in distance between the different points as well as the ‘flow’ of the smile — how much, how far, and how fast the different points on the face moved as the smile was formed.

Next, the researchers looked at whether there were any notable differences between men and women. They found that there were, with women’s smiles being more expansive.

“Anecdotally, women are thought to be more expressive in how they smile, and our research has borne this out. Women definitely have broader smiles, expanding their mouth and lip area far more than men,” said lead researcher Professor Hassan Ugail from the University of Bradford. Read more from psychcentral.com…

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