To survive physically or psychologically, we sometimes need to react automatically to a speeding taxi as we step off the curb or to the subtle facial cues of an angry boss. (scientificamerican.com)
A new research suggests that humans are excellent at observing facial cues of other people to determine whether they're sick or not. (techtimes.com)
For example, studies show that infants, including those who are blind or have underdeveloped brains, use facial cues to tell their parents how they feel. (scientificamerican.com)