Jennifer McNulty in Phys.Org:
Every time we look at a face, we take in a flood of information effortlessly: age, gender, race, expression, the direction of our subject’s gaze, perhaps even their mood. Faces draw us in and help us navigate relationships and the world around us.
How the brain does this is a mystery. Understanding how facial recognition works has great value—perhaps particularly for those whose brains process information in ways that make eye contact challenging, including people with autism. Helping people tap into this flow of social cues could be transformational. A new study of facial “fixation” led by Nicolas Davidenko, an assistant professor of psychology at the University of California, Santa Cruz, boosts our insights considerably. “Looking at the eyes allows you to gather much more information,” said Davidenko. “It’s a real advantage.” By contrast, the inability to make eye contact has causal effects. “It impairs your facial processing abilities and puts you at a real social disadvantage,” he said. People who are reluctant to make eye contact may also be misperceived as disinterested, distracted, or aloof, he noted. Scientists have known for decades that when we look at a face, we tend to focus on the left side of the face we’re viewing, from the viewer’s perspective. Called the “left-gaze bias,” this phenomenon is thought to be rooted in the brain, the right hemisphere of which dominates the face-processing task.
More here.