%0 Journal Article %A Warneken, Felix %A Tomasello, Michael %+ Department of Developmental and Comparative Psychology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society Department of Developmental and Comparative Psychology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society %T Extrinsic rewards undermine altruistic tendencies in 20-month-olds : %G eng %U https://hdl.handle.net/11858/00-001M-0000-0023-C84A-9 %R 10.1037/2333-8113.1.S.43 %R 0.1037/2333-8113.1.S.43.supp %D 2014 %* Review method: peer-reviewed %X This article is reprinted from Developmental Psychology, 2008, Vol. 44, No. 6, 1785–1788. %J Motivation Science %V 1 %N S %& 43 %P 43 - 48 %I Am. Psych. Ass. %@ 2333-8113