The junction (yellow) between the parietal and the temporal lobes, in which the relative proportion of gray matter is significantly positively correlated with the propensity for altruistic behavior. (Credit: University of Zurich)The volume of a small brain region influences one’s predisposition for altruistic behavior. Researchers from the University of Zurich show that people who behave more altruistically than others have more gray matter at the junction between the parietal and temporal lobe, thus showing for the first time that there is a connection between brain anatomy, brain activity and altruistic behavior.

Why are some people very selfish and others very altruistic? Previous studies indicated that social categories like gender, income or education can …