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a) Depiction of the social two-arm bandit task for fMRI. Participants were told to receive as many smiles as they could, and accordingly to choose the face on each trial they believed was most likely to smile. b) The probability of each face smiling (vs frowning) changed very 25 trials. The probabilities of the two faces were linked, such that the sum of the two probabilities always equaled 1.
