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Medical Decision Making
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A Theory of Medical Decision Making and Health: Fuzzy Trace Theory

Valerie F. Reyna, PhD

Departments of Human Development and Psychology, CornellUniversity, Ithaca, New York, vr53{at}cornell.edu

The tenets of fuzzy trace theory are summarized with respect to their relevance to health and medical decision making. Illustrations are given for HIV prevention, cardiovascular disease, surgical risk, genetic risk, and cancer prevention and control. A core idea of fuzzy trace theory is that people rely on the gist of information, its bottom-line meaning, as opposed to verbatim details in judgment and decision making. This idea explains why precise information (e.g., about risk) is not necessarily effective in encouraging prevention behaviors or in supporting medical decision making. People can get the facts right, and still not derive the proper meaning, which is key to informed decision making. Getting the gist is not sufficient, however. Retrieval (e.g., of health-related values) and processing interference brought on by thinking about nested or overlapping classes (e.g., in ratio concepts, such as probability) are also important. Theory-based interventions that work (and why they work) are presented, ranging from specific techniques aimed at enhancing representation, retrieval, and processing to a comprehensive intervention that integrates these components.

Key Words: Key words: decision aids • risk communication • informed decision making • risk perception • behavior change.

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This version was published on November 1, 2008

Medical Decision Making, Vol. 28, No. 6, 850-865 (2008)
DOI: 10.1177/0272989X08327066
SAGE Open article

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