Which cue should you use if you were to attempt to predict life expectancy of a group of people,and the only information you had available were their photo albums

Question

Quizplus · Accepted Answer

The Duchenne smile, characterized by the simultaneous contraction of the zygomatic major muscle (which raises the corners of the mouth) and the orbicularis oculi muscle (which raises the cheeks and forms crow's feet around the eyes), is a strong indicator of genuine happiness and positive emotional states. Research has linked positive emotions and genuine happiness, as reflected by Duchenne smiles, to better health outcomes and longer life expectancy. Therefore, the frequency of Duchenne smiles in photos could be a more reliable cue for predicting life expectancy compared to the other options, which do not directly relate to the individual's emotional state or overall well-being.

Which Cue Should You Use If You Were to Attempt