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    Using the EZ-diffusion model to score a single-category implicit association test of physical activity

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    Authors
    Rebar, Amanda
    Ram, N.
    Conroy, D.
    Date
    2015
    Type
    Journal Article
    
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    Citation
    Rebar, A. and Ram, N. and Conroy, D. 2015. Using the EZ-diffusion model to score a single-category implicit association test of physical activity. Psychology of Sport and Exercise. 16 (P3): pp. 96-105.
    Source Title
    Psychology of Sport and Exercise
    DOI
    10.1016/j.psychsport.2014.09.008
    ISSN
    1469-0292
    School
    School of Psychology
    URI
    http://hdl.handle.net/20.500.11937/71764
    Collection
    • Curtin Research Publications
    Abstract

    © 2014 Elsevier Ltd. Objective: The Single-Category Implicit Association Test (SC-IAT) has been used as a method for assessing automatic evaluations of physical activity, but measurement artifact or consciously-held attitudes could be confounding the outcome scores of these measures. The objective of these two studies was to address these measurement concerns by testing the validity of a novel SC-IAT scoring technique. Design: Study 1 was a cross-sectional study, and study 2 was a prospective study. Method: In study 1, undergraduate students (. N=104) completed SC-IATs for physical activity, flowers, and sedentary behavior. In study 2, undergraduate students (. N=91) completed a SC-IAT for physical activity, self-reported affective and instrumental attitudes toward physical activity, physical activity intentions, and wore an accelerometer for two weeks. The EZ-diffusion model was used to decompose the SC-IAT into three process component scores including the information processing efficiency score. Results: In study 1, a series of structural equation model comparisons revealed that the information processing score did not share variability across distinct SC-IATs, suggesting it does not represent systematic measurement artifact. In study 2, the information processing efficiency score was shown to be unrelated to self-reported affective and instrumental attitudes toward physical activity, and positively related to physical activity behavior, above and beyond the traditional D-score of the SC-IAT. Conclusions: The information processing efficiency score is a valid measure of automatic evaluations of physical activity.

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