assess emotion (Blumberg & Izard, 1985; Keltner, Moffitt, & Stouthamer-Loeber, 1995; Zahn-Waxler et al., 1994). There often may be a discrepancy between children’s felt emotions and what they express or what is measured. In addition, social withdrawal, a type of internalizing problem, can occur for multiple reasons, not all of which involve negative emotion (Coplan & Armer, 2007). Moreover, the co-occurrence of externalizing problems might dilute the association between internalizing symptoms and sadness.
