 Social exclusion isn't the only thing that pushes people toward extremism. Nafis and other researchers have noted that it's often a cascade of life events combined with an experience of social exclusion that leads to radicalization. He witnessed this firsthand while working with that charismatic research assistant who had helped him find volunteers for the brain imaging study. So I think he, in the beginning, sort of saw me as a little bit of like an older brother figure.