Distinguishing facial features
You may think you can judge a person you just met based on his or her facial expressions. Does a smile indicate a person is easygoing or insincere? Does squinting show concentration, or mistrust? First impressions of people — such as whether they are trustworthy, dominant or attractive — can develop from a glimpse as brief as milliseconds or less. Brain scans suggests that such judgments are made automatically, probably outside of people's conscious control. But now, a computer system that mimics the human brain has identified which facial features most influence how others first perceive a person, scientists say.