1 ene 2010 año - Dunfield and Kuhlmeier
Descripción:
This study showed that we often help those who have helped us, a reciprocity norm. The study/experiment was done with infants and showed that infants were more helpful to an adult after the adult had given them a toy first.
Añadido al timeline:
fecha:
1 ene 2010 año
Ahora mismo
~ 15 years ago