a) Symbolic representation of the two-step task adapted from Daw et al. and Kool et al. which was performed during fMRI at the beginning of the ecological momentary assessment (EMA) period. Each out of 201 trials started in a first state (planet earth), where subjects had to choose between two actions (spaceships). Each action led to one out of two second-stage states (planets) with a higher probability (common…