“…A number of studies have linked heightened inertia, particularly of negative affect (NA), with indicators of increased vulnerability to depression, such as neuroticism (Suls et al, 1998), low self-esteem (Kuppens, Allen, et al, 2010), trait rumination (Koval, Kuppens, Allen, & Sheeber, 2012), subclinical depressive symptoms (Brose, Schmiedek, Koval, & Kuppens, 2015; Koval et al, 2013), and the 5-HTTLPR polymorphism (Kuppens, van Roekel, Verhagen, & Engels, 2015). A direct link between emotional inertia and future onset of MDD has also been demonstrated (Kuppens et al, 2012; van de Leemput et al, 2014).…”