For these reasons, although the externalizing label is still being utilized by others, we turn to the finer-grained undercontrol or disinhibition labels, which are more descriptive of the underlying trait (Sher & Trull, 1994; McGue, Iacono, Legrand, Malone, & Elkins, 2001; Wong et al., 2006). From this point on, we refer to the core disinhibitory construct as one of behavioral undercontrol/disinhibition. While it is premature to regard one descriptor as more primary than the other, in order to differentiate them, we use the term undercontrol when the referent is to expression at the behavioral level, and the term disinhibition when the referent is to the neurophysiological and/or neurocognitive indicator (also see Kagan & Snidman, 2004).
