Awe is an emotional response to perceptually vast stimuli that transcend current frames of reference.
Guided by conceptual analyses of awe as a collective emotion, across 5 studies (N = 2,078) we tested
the hypothesis that awe can result in a diminishment of the individual self and its concerns, and increase
prosocial behavior. In a representative national sample (Study 1), dispositional tendencies to experience
awe predicted greater generosity in an economic game above and beyond other prosocial emotions (e.g.,
compassion). In follow-up experiments, inductions of awe (relative to various control states) increased
ethical decision-making (Study 2), generosity (Study 3), and prosocial values (Study 4). Finally, a
naturalistic induction of awe in which participants stood in a grove of towering trees enhanced prosocial
helping behavior and decreased entitlement compared to participants in a control condition (Study 5).
Mediational data demonstrate that the effects of awe on prosociality are explained, in part, by feelings
of a small self. These findings indicate that awe may help situate individuals within broader social
contexts and enhance collective concern. (abstract take from Piff et al., 2015)
Question: In the above abstract, which of the following describes the study design(s)?