“…In 2006, Smallwood and Schooler published their seminal review of the fledgling scientific literature on mind wandering. The next decade and a half saw rapid growth in mind-wandering research, particularly within cognitive psychology and neuroscience (see Callard et al, 2013), but also across such diverse contexts as aeronautics and astronautics (e.g., Casner & Schooler, 2014;Gontier, 2017), education (e.g., Wammes et al, 2016aWammes et al, , 2016b, human factors (e.g., Burdett et al, 2019;Walker & Trick, 2018), lifespan development (e.g., Jackson & Balota, 2012;Soemer et al, 2019;Stawarczyk et al, 2014), personality (e.g., Perkins et al, 2015;, philosophy (e.g., Irving, 2016;Metzinger, 2013), and psychopathology (e.g., Chen et al, in press;Hoffmann et al, 2018;Lanier et al, in press;Makovac et al, in press). And, despite a research pace and impact that has supported numerous reviews and theoretical commentaries (e.g., Christoff & Fox, 2018;Klinger, 2013;Mildner & Tamir, 2019;Mittner et al, 2016;Smallwood & Andrews-Hanna, 2013;Smallwood & Schooler, 2015), little published work has focused on the validity of subjects' self-reported mind-wandering experiences.…”