Individual post-experimental interview results.

Note: Question I: “How often did you make a decision earlier during the trial but waited with the button press?” (0 = never; 4 = always); Question II: “How would you rate your spontaneity throughout the experiment?” (0 = not spontaneous at all; 4 = very spontaneous); Question III: “How often did you explicitly think about the timing of your decisions?” (0 = never; 4 = always); Question IV: “What did you think about during the experiment, as far as you can remember?”; Question V: “Did you notice any changes in your behaviour during the experiment? If yes, what changed?” One subject (S4) was excluded from all analyses because of behavioural criteria.