Questionnaires
Questionnaires presented after the fMRI experiment assessed the
perceived risk of options and difficulty of decisions using a rating
scale ranging from 1 (no difficulty) to 9 (very difficult). Participants
were further asked to rate how much they decided between options as a
function of the amount of potential gain or potential loss of the choice
and how much they felt influenced while choosing by the probability of
wins and losses of their decision options. For all of these rating
questions, we presented examples taken from the real experiment, which
represented each of the experimental conditions respectively (one sample
trial for each condition to remind participant of the condition). We
realized all levels of risk and ambiguity; the ratings were made
separately for each experimental trial that represented each condition.
We also included several personality questionnaires (results will be
presented elsewhere) to assess trait-like differences related to
decision-making (Budner, 1962;
Carver & White, 1994;
McLain, 2009;
Zuckerman, 1996).