We make complex judgments about people simply by looking at their faces, and this can go beyond race and gender.
Researchers explored social categories, personality traits and emotional states in their study.
This study helped understand the manner in which we categorize people, including stereotyping and discrimination.
In the words of Kimberly, a researcher from the University of Birmingham, "How we perceive faces is not just a reflection of what's in those faces. We are not objective;we bring our current goals and past knowledge to every new encounter. And this happens really quickly - within a couple of hundred milliseconds of seeing the face."