Abstract
Background
Correlational evidence suggests that perceived control (PC) and intrinsic motivation (IM), key constructs in social cognitive and self-determination theories, may interact to reinforce behavior change.
Purpose
This proof-of-principle study examines the independent and synergistic effects of interventions to increase PC and IM upon dental flossing frequency.
Methods
University students (n = 185) were randomized in a 2 × 2 full factorial design to receive two computer-based interventions: one to either increase or decrease PC and another to increase either IM or extrinsic motivation. These constructs were measured immediately post-intervention; flossing behavior was measured 1 week later.
Results
The interventions to increase PC and PC/IM had main and interaction effects on flossing, respectively. The PC/IM interaction effect was mediated by increases in PC and IM.
Conclusions
Combining interventions to increase PC and IM seems to be a promising avenue of research, which has implications for both theory and intervention development.
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Authors Statement of Conflict of Interest and Adherence to Ethical Standards
Authors Liam Staunton, Paul Gellert, Keegan Knittle, and Falko F. Sniehotta all declare to have no conflict of interest. All procedures, including the informed consent process, were conducted in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000. The study was approved by the School of Psychology Ethical Board of Aberdeen University (PEC: 1810060780).
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Staunton, L., Gellert, P., Knittle, K. et al. Perceived Control and Intrinsic vs. Extrinsic Motivation for Oral Self-Care: A Full Factorial Experimental Test of Theory-Based Persuasive Messages. ann. behav. med. 49, 258–268 (2015). https://doi.org/10.1007/s12160-014-9655-2
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DOI: https://doi.org/10.1007/s12160-014-9655-2