People can quickly understand others, but how our brains do this is not fully understood. This study looked at how we group and distinguish people, focusing on how our brains process this information. They found that our right brain hemisphere is better at telling individuals apart within a group, while the left hemisphere is better at categorizing people into groups. Brain scans showed that when we distinguish individuals, specific areas in the right side of our brain are active. This research helps us understand how our brains perceive and categorize people.