Abstract
Prompts to evaluate ourselves relative to others (i.e., social comparison) are increasingly engineered into
our daily lives to promote specific behaviors, including in digital health technologies and health behavior
change interventions. Despite its ubiquity, however, we do not yet understand how social comparison
affects health behavior, including its demonstrated negative effects. Our poor understanding of the
mechanistic pathway linking social comparison to health behavior limits the efficacy of many of our
chronic disease prevention and intervention efforts. The proposed DP2 New Innovator Award will
address the critical and overlooked opportunity to understand how social comparison affects health
behavior, by introducing a new paradigm for research in this area. The traditional approach to studying
the effects of social comparison uses methods that describe static differences between people, which
cannot identify the nuances of what happens when comparison occurs in daily life. By assessing the
complexities of social comparison and health behavior as they occur (using ambulatory, naturalistic
assessment), and embedding a randomized experimental design, the proposed series of iterative studies
will finally identify the unknown causal, mechanistic pathway(s) from social comparison to health
behavior. This novel approach will be applied to the exemplar of physical activity leaderboards – a widely
disseminated method for activating social comparison that has shown both positive and negative effects
on physical activity – to understand how social comparison affects physical activity behavior among
insufficiently active adults (total N = 300). This innovative approach will be guided by the PI’s new,
detailed theoretical model of how social comparison affects health behaviors in the natural environment.
Consequently, the proposed work will have a meaningful public health impact, by generating evidence-
based recommendations for the optimal use of comparison to promote healthy behavior while minimizing
its negative consequences. This work will also advance behavioral science and related fields by
providing a roadmap for testing the effects of social comparison on other health behaviors and outcomes.
