From WSJ.com by Sumathi Reddy:
Children still in kindergarten or even younger form cliques and intentionally exclude others, say psychologists and educators who are increasingly noticing the behavior and taking steps to curb it.

Special programs are popping up in elementary schools to teach empathy as a means of stemming relational aggression, a psychological term to describe using the threat of removing friendship as a tactical weapon. Children also are being guided in ways to stand up for themselves, and to help others, in instances of social exclusion. Though both boys and girls exhibit relational aggression, it is thought to be more common among girls because they are generally more socially developed and verbal than boys.

"I think it's remarkable that we're seeing this at younger and younger ages," said Laura Barbour, a counselor at Stafford Primary School in West Linn, Ore., who has worked in elementary schools for 24 years. "Kids forget about scuffles on the playground but they don't forget about unkind words or being left out."

Relational aggression is a relatively new term in psychology, devised to distinguish it from physical aggression. There is no research showing that relational aggression is increasing or manifesting itself earlier, experts say. An increasing awareness of it, however, may be what's fueling educators' perception that it is starting earlier and becoming more common.

Generally thought of as a middle-school phenomenon, relational aggression is less explored among young children. Experts say it often goes under the radar because it is harder to detect than physical aggression. The behavior is similar to verbal aggression but revolves around threatening the removal of a friendship. Examples include coercing other children not to play with someone else or threatening not to invite them to your birthday party if they don't do what you want them to do.

"It actually works so well because of the child's limited cognitive abilities," said Jamie Ostrov, an associate professor of psychology at the University at Buffalo, State University of New York. Dr. Ostrov, who has conducted observational studies of relational aggression in 3-to-5-year-olds, said he has detected signs of the behavior in children as young as 2˝ years. It isn't clear why some children are more inclined to relational aggression than others. There is evidence that children can learn these behaviors by observing parents or older siblings, as well as from media, Dr. Ostrov said.

Unlike physical aggression, relational aggression increases with age, often peaking in middle school, said Charisse Nixon, chair of the psychology department at Penn State Erie. Some research indicates that girls are more affected than boys by relational aggression as they perceive it as more damaging to their social relationships, she said.

Dr. Nixon's research has found that an average of 50% of children and adolescents—grades five through 12—have experienced relational aggression at least monthly. About 7% of children report experiencing physical aggression on a daily or weekly basis.

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