About the Project

Dual-process theories and methods emerging from basic research on decision, memory, social cognition, and neuroscience have much potential for scientifically resolving fundamental questions about HIV risk behavior and its link to drug use. Indeed, new approaches are necessary, because behaviors known to cause increased risk of HIV/AIDS are perplexing — they persist in some individuals or populations despite devastating, widely known consequences.

Many approaches have attempted to explain risk behavior through theories of rational or deliberate processes, for example, in which people weigh the pros and cons and make a decision, or through dispositional characteristics of personality, in which some people are simply predisposed. Although previous approaches have been valuable, they may miss some fundamental processes governing risk behavior. Particularly, they seldom answer why people engage in these behaviors even when the hazards are understood.

A different approach applies the growing evidence across disciplines for at least two independent, but potentially interacting systems or processes that govern risky decisions: an autonomous, implicit or automatic system and a more reflective or deliberate system. The research proposed in this application investigates each class of system in multiple ways, evaluating alternative theoretical models of dual-processes. As an example, the more automatic system may affect risk behavior because the content of associations in memory processed in this system lead to spontaneously activated biases in decisions in favor of pre-existing, strong associations, not in favor of more difficult to activate, learned facts about HIV risk. Another model in this framework suggests a “buffer interaction” process, in which adequate functioning of reflective systems may dampen the otherwise “free reign” of spontaneous associations on risky behavior.

This project investigates these hypotheses and several alternatives in a population at known risk for the transmission of HIV: adult non-injection drug users. The project conducts refinements of assessments and initial evaluations of alternative models in an efficient cross-sectional study and comprehensive evaluation of alternative hypotheses in a four-wave intensive prospective study. An evaluation of these alternatives may be critical for improvements in interventions in this population, because the findings address fundamental processes that are seldom acknowledged in intervention efforts.


Alan Stacy
Alan Stacy, PhD
Principal Investigator
Email address: alan.stacy@cgu.edu

Susan Ames
Susan L. Ames, PhD
Co-Principal Investigator
Email address: susan.ames@cgu.edu

Ongoing Activities

This research project is currently in the process of measuring subjects. For more information, please contact Amy Custer at amy.custer@cgu.edu.


Wiers R, Havermans R, Deutsch R, Stacy AW. A mismatch with dual process models of addiction rooted in psychology. Behavioral and Brain Sciences 2008;31:460-460.

Stacy AW., Ames, S W., Wiers, R W., Krank, M. Associative memory in appetitive behavior: Framework and relevance to epidemiology and prevention. In L. M. Scheier (Ed.). Handbook of Drug Use Etiology. APA Books: Washington, DC., 2009.

Wiers RW., Houben K., Roefs A., de Jong P., Hofmann W., Stacy AW. Implicit cognition in health psychology, In B. Gawronski & K. Payne (Eds), Handbook of Implicit Social Cognition: Measurement, Theory and Applications. New York: Guildford, in press.


Funding for Dual Processes in HIV Risk Behavior in Drug Abusers was provided by Award Number RO1 DA023368 from the National Institute On Drug Abuse. The content displayed is solely the responsibility of the authors and does not necessarily represent the official views of the National Institute On Drug Abuse or the National Institutes of Health.