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 .
does a smile indicate a person is easygoing or insincere ?
a computer model that could predict first impressions .
then , the researchers used it to generate cartoon faces combined with the respondents ' first impressions .
three key dimensions of a first impression approachability : how likely is this person to help within moments of meeting someone new , we ' ve make both conscious and subconscious judgments about them — even if we 're just looking at a picture of them .
first impressions largely hinge on a person 's facial features , which we judge on three major axes : dominance , approachability and attractiveness .
now , researchers publishing in proceedings of the national academy of sciences have revealed the underpinnings of our snap judgments .
brain scans suggests that such judgments are made automatically , probably outside of people 's conscious control .