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Angel Blanch served as action editor.
This study was not preregistered. Data and analysis code for this study are available by emailing the corresponding author.
Martin Sellbom is a coauthor of the Multidimensional Personality Questionnaire and receives royalties from its sales. He is also a paid consultant to the University of Minnesota Press, publisher of the Multidimensional Personality Questionnaire. He received a grant from the University of Minnesota Press to support this project. The author thanks Yossef Ben-Porath for his helpful feedback on an earlier draft of this article.
The author publishes this article in memory of Auke Tellegen, who passed away shortly before this article was composed. Tellegen’s legacy in the areas of personality, clinical assessment, and psychometrics is indelible; his impressions on this author personally enduring; and he deeply values the opportunities he had to work with him, including on the publication of the Multidimensional Personality Questionnaire.
Martin Sellbom played a lead role in conceptualization, data curation, formal analysis, funding acquisition, investigation, methodology, project administration, resources, validation, and writing–original draft.
The current investigation was designed to examine the impact of underreporting response bias on the Multidimensional Personality Questionnaire (MPQ) and the utility of the Unlikely Virtues scale in detecting such responding. Study participants were randomly assigned to either the underreporting (n = 100) or standard instruction (n = 224) conditions. All participants first completed a series of extratest measures under standard instruction prior to the MPQ administration. The results showed that individuals in the underreporting condition scored significantly higher on MPQ scales that reflect positive emotionality and self-control and lower on scales that indicate negative emotionality compared to those in the standard instruction. Moreover, the psychometric validity of MPQ scale scores against extratest measures was...