Artistic Photos Of Human Face

Emotion
Faces are essential to expressing emotion, consciously or unconsciously. A frown denotes disapproval; a smile usually means someone is pleased. Being able to read emotion in another's face is "the fundamental basis for empathy and the ability to interpret a person’s reactions and predict the probability of ensuing behaviors". One study used the Multimodal Emotion Recognition Test to attempt to determine how to measure emotion. This research aimed at using a measuring device to accomplish what people do so easily everyday: read emotion in a face.
People are also relatively good at determining if a smile is real or fake. A recent study looked at individuals judging forced and genuine smiles. While young and elderly participants equally could tell the difference for smiling young people, the "older adult participants outperformed young adult participants in distinguishing between posed and spontaneous smiles". This suggests that with experience and age, we become more accurate at perceiving true emotions across various age groups.