Cooperative and prosocial behavior plays a crucial role in a well-functioning society, but not all individuals exhibit the same level of cooperativeness and altruism. How prosocial someone is can also be discerned during deep sleep, as demonstrated by researchers led by Daria Knoch, Professor of Social Neuroscience at the University of Bern: "The more so-called slow waves a person exhibits in deep sleep in a brain area called right temporo-parietal junction (TPJ), the more prosocial they act. Among other functions, this region of the brain is important to take the perspective of others,” explains Daria Knoch. The results have recently been published in 'The Journal of Neuroscience.'