Fig 1.
Messages from trustees were shown on the screen. Subjects could either invest to keep the entire tokens endowed on each round. Subject’s earning on that round was displayed if the “invest” option was chosen.
Fig 2.
FRN results during outcome evaluation.
For illustrative purpose, grand-averaged ERP waveforms of FRN from 2 midline frontal electrodes (Fz, FCz) were shown over outcome (reciprocity vs. non-reciprocity) and commitment (promise vs. non-promise).