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Reward paradigm design. (a) Trial structure demonstrating choice phase, anticipation phase, numerical feedback and outcome (win, loss and neutral). (b) Description of the outcomes associated with each of the four stimuli (win, mixed, neutral and loss respectively). Transition probabilities are 0.5 except for the neutral stimulus. (c) Example of a post-task trial, in which participant has to choose between card stimulus and ‘sure thing' option.
