1 янв 2010 г. - Dunfield and Kuhlmeier
Описание:
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.Добавлено на ленту времени:
Дата:
1 янв 2010 г.
Сейчас
~ 15 г назад