Gratitude in the Brain (IMAGE)
Caption
Experiment procedure and behavioral results.
(A) At the beginning of each trial, the participants were (ostensibly) paired with one of three co-players. Then the participants saw a pain-money pair and waited for the co-player's decision. If the coplayer chose Help, then the co-player lost the corresponding amount of bonus while the participants would be exempted from the pain stimulation on this trial. If the coplayer chose NoHelp, then the co-player could keep the bonus while the participants had to receive the corresponding pain stimulation. The presentation of the co-player's decision was defined as the critical events in the fMRI data analysis. At the end of the trial, the participant could allocate 20 Yuan (? 3 USD) between him/herself and the co-player, with the knowledge that the co-player was not aware of this procedure.
(BC) Post-scan gratitude rating and allocation during scanning (i.e., reciprocity) as a function of self-benefit and benefactor-cost.
(D) Relative weight of benefactor-cost over self-benefit in gratitude rating.
Credit
Yu et al., <em>JNeurosci</em> (2018)
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