Warneken, F., &Tomasello, M. (2006). Altruistic helping in human infants and young chimpanzees. science, 311(5765), 1301-1303.
Human beings routinely help others to achieve their goals, even when the helper receives no immediate benefit and the person helped is a stranger. Such altruistic behaviors (toward non-kin) are extremely rare evolutionarily, with some theorists even proposing that they are uniquely human. Here we show that human children as young as 18 months of age (prelinguistic or just-linguistic) quite readily help others to achieve ...