Social rewards are often compared in experimental designs with non-social ones: a popular pair is money (non-social) vs. a smile (social). However, we often forget that money and smiles differ on many more dimensions than just sociality. For example, money is tangible, but a smile is not. Can we then draw informative conclusions about the differences in the brain processing of social and non-social rewards? We argue that to do so, we need to use a multidimensional view on rewards.
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