Abstract
Background
Behavioral measurement of attention bias for emotional stimuli has traditionally ignored whether trial-level task data have a strong enough general factor to justify a unidimensional measurement model. This is surprising, as unidimensionality across trials is an important assumption for computing bias scores.
Methods
In the present study, we assess the psychometric properties of a free-viewing, eye-tracking task measuring attention for emotional stimuli. Undergraduate students (N = 130) viewed two counterbalanced blocks of 4 × 4 matrices of sad/neutral and happy/neutral facial expressions for 10 seconds each across 60 trials. We applied a bifactor measurement model across ten attention bias metrics (e.g., total dwell time for neutral and emotional stimuli, ratio of emotional to total dwell time, difference in dwell time for emotional and neutral stimuli, a variable indicating whether dwell time on emotional stimuli exceeded dwell time on neutral stimuli) to assess whether trial-level data load on to a single, general factor. Unidimensionality was evaluated using omega hierarchical, explained common variance, and percentage of uncontaminated correlations.
Results
Total dwell time had excellent internal consistency for sad (ɑ = .95, ɷ = .96) and neutral stimuli (ɑ = .95, ɷ = .95), and met criteria for unidimensionality, suggesting the trial-level data within each task reflect a single underlying construct. However, the remaining bias metrics fell short of the unidimensionality thresholds, suggesting not all metrics are good candidates for creating bias scores.
Conclusion
Total dwell time by valence had the best psychometrics in terms of internal consistency and unidimensionality. This study demonstrates the importance of assessing whether trial-level data load onto a general factor, as not all metrics are equivalent, even when derived from the same task data.
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Data Availability
The data that support the findings of this study are available in our Supplementary Materials within the Texas Data Repository at https://dataverse.tdl.org/dataverse/factor_structure_attention.
Notes
While 18–45 was the inclusion criteria for age of the sample, average age was 19.4 years (SD = 1.4), and maximum age was 28 years. Only 4 participants were over the age of 22 (23, 23, 24, and 28). We confirmed the inclusion of these participants in our sample had no meaningful impact on the results through supplementary analyses that can be found at https://dataverse.tdl.org/dataverse/factor_structure_attention.
As a reminder, the stimuli selection processes for each task were independent, so different pools of neutral facial expressions are used in the happy version and sad version (some of the same neutral faces may be in both tasks).
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Mary McNamara, Kean Hsu, Bryan McSpadden, and Semeon Risom report no conflicts of interest. Christopher Beevers has received grant funding from the National Institutes of Health, Brain and Behavior Foundation, and other not-for profit foundations. He has received income from the Association for Psychological Science for his editorial work and from Orexo, Inc. for serving on a Scientific Advisory Board related to digital therapeutics. Dr. Beevers’ financial disclosures have been reviewed and approved by the University of Texas at Austin in accordance with its conflict-of-interest policies. Jason Shumake has received grant funding from the National Institutes of Health as well as salary and stock options from Aiberry, Inc. Drs. Beevers’ and Shumake’s financial disclosures have been reviewed and approved by the University of Texas at Austin in accordance with its conflict of interest policies.
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McNamara, M.E., Hsu, K.J., McSpadden, B.A. et al. Beyond Face Value: Assessing the Factor Structure of an Eye-Tracking Based Attention Bias Task. Cogn Ther Res 47, 772–787 (2023). https://doi.org/10.1007/s10608-023-10395-4
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DOI: https://doi.org/10.1007/s10608-023-10395-4