LAUSR

The present research assessed the psychometric multidimensionality and criterion-related validity the Interpersonal Behaviours Questionnaire using the bifactor-exploratory structural equation modeling framework. Study 1 relied on a sample of 772 participants, and supported the superiority of a bifactor-ESEM representation compared to alternative representations. Ratings of need supportive and thwarting behaviors simultaneously reflected a global overarching need nurturing behaviors construct (rather than two separate need supportive and need thwarting behaviors), which co-existed with six specific dimensions (autonomy, competence, and relatedness need supportive and thwarting behaviors). These results were replicated in a second independent sample of 742 participants and across gender. Our findings supported the criterion-related validity of interpersonal behaviors in relation to positive affect, negative affect, and need fulfillment across samples and genders. We finally discuss the theoretical and practical implications of relying on the bifactor-ESEM framework when investigating need supportive and thwarting interpersonal behaviors.