To be more precise, that's a cognitive neuroscientist and a behavioral psychologist that Riot have employed, and these highly-trained professionals will help the "PB&J" team understand why some LoL players are so offensive or, as lead producer Travis George puts it, “being mean for the sake of being mean.”
Riot have kept a close eye on the behaviour of their community and this is all part of their continued effort to stop players "being jerks" to one another. The game's Tribunal system was set up last year to allow the community to self-moderate and several prominent esports players have been disciplined for their conduct. Back in September, Eryk
“Hosan” Wilczynski of Polish team EloHell was suspended and yesterday we reported on the permanent banning of Christian "IWillDominate" Rivera.
George announced the PB&J team in an interview with Gamasutra, saying he accepted a certain amount of trash-talking was part of the culture, but that Riot wanted to find ways to promote good conduct and understand why some players felt the need to be so offensive. "This is going to be a major focus for us," he said.
Thanks to PCGamer.