Despite great interest in Mind Wandering, a fully validated questionnaire has been lacking. The Four Factors of Mind Wandering (4FMW) Questionnaire, presented here, meets this demand. First, 80 items were judged for content validity by two panels of experts. Those items that survived this content validity assessment were then tested using exploratory and confirmatory factor analyses on two independent samples of young adults. The 16 resulting items were shown to cluster into four factors (i.e., Failure in social interaction, Failure in interaction with objects, Unawareness, and Inattention). The 4FMW questionnaire showed good reliability, robust structure, and acceptable goodness-of-fit indices, as well as good convergent validity with another Mind Wandering questionnaire. Importantly, the 4FMW questionnaire was able to discriminate between attention-deficit/hyperactivity disorder and obsessive-compulsive disorder symptoms. The 4FMW Questionnaire is a reliable and valid instrument for assessing mind wandering in the young adult population.
Keywords: ADHD; OCD; clinical validity; construct validity; content validity; mind wandering; psychometrics.