Conditions of risk: L = low, M = mixed, H = high; probabilities of the 2 alternative wins and losses in gamble options 1 and 2 of each trial: pwin1, ploss1, pwin2, ploss2; monetary outcome for wins and losses in the gambles 1 and 2: win1, loss1, win2, loss2.
FIGURE CAPTIONS (for files attached)
Figure 1a: Example trial with high ambiguity showing all events and their timing. The fixation cross (1st frame) was followed by the option screen (2nd frame). Upon button press green colour indicated the choice (3rd frame) and subsequently feedback of the current trial was presented (4th screen) followed by the sum of all trials (5th screen) and the fixation cross of the next trial.
Figure 1b: Probability of choosing the higher risk option during the risk block (upper panel) and the ambiguity block (lower panel) for the three levels of risk.
Figure 2: Activation in parahippocampus during mixed-risk trials in comparison to high- and low-risk trials.
Figure 3: Activation of inferior frontal gyrus IFG (BA 47) during mixed-risk trials with high ambiguity versus averaged high- and low-risk trials with high ambiguity
Figure 4: Activation of SMA (BA 6) during mixed-risk trials with low ambiguity versus averaged high- and low-risk trials with low ambiguity
Figure 5: Activation of DLPFC (BA 9) during mixed-risk trials with high ambiguity versus mixed-risk trials with low ambiguity
Figure 6: Activation of dACC (BA 32) during mixed-risk trials for parameteric analysis of potential wins in comparison to high- and low-risk trials
Figure 7: Activation of the insular cortex and the OFC during mixed-risk trials for the parameteric analysis of potential losses in comparison to high- and low- risk trials
Figure 8: Activation of the amygdala during mixed-risk trials for trials with high ambiguity in the parameteric analysis of potential wins versus mixed-risk trials with low ambiguity.
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