Researchers at the University of St Andrews in the UK have found that getting enough sleep may help individuals appear more intelligent to their teachers and prospective employers by influencing their neutral expression.

The research sheds light on how people may change their perceived intelligence regardless of their attractiveness, and it appears the answer lies in the neutral facial expression.

Using special face-processing software, researchers measured the degree of eyelid openness and mouth curvature of 190 faces (children and adults), who were photographed with a 'neutral expression.'

Over 200 evaluators were then asked to rate the attractiveness and intelligence of the faces - the results show that those faces with a subtle frown and droopy eyes were perceived as less intelligent.

"Attractive people are often perceived as more intelligent, but we wanted to investigate how individuals can change their perceived intelligence, regardless of their attractiveness," said Sean Talamas from University of St Andrews.

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