prosocial Risk factors 1 article 1 child 1 cortisol 1 cross-cultural developmental psychology 1 developmental psychology 1 dictator game 1 empathy 1 generosity 1 giving 1 human 1 juvenile 1 knowledge base 1 methodology 1 prosocial behavior 1 risk factor 1 risky and vulnerable contexts 1 social ecological model 1 stress 1 theoretical study 1 trier social stress test 1