“…It should be noted, however, that the role of the BIS has been revised in more recent formulations of Gray's theory (Gray & McNaughton, 2000;McNaughton & Corr, 2004). Thus, McNaughton and Corr (2004) view the BIS as a conflict detection system associated with anxiety that modulates both the BAS in regulating approach behavior in reward-related contexts and the flight/fight system in regulating avoidance behavior in fear-eliciting contexts A number of investigators have distinguished between two groups of socially withdrawn children: a shy-conflicted, reticent group that wishes to engage in peer interactions but withdraws due to fear and anxiety; and a passive-solitary, disinterested group that withdraws due to a lack of desire for social interactions (Asendorpf, 1990;Coplan, Prakash, O'Neil, & Armer, 2004;Coplan, Rubin, Fox, Calkins, & Stewart, 1994;Harrist, Zaia, Bates, Dodge, & Pettit, 1997). Importantly, these subgroups have been shown to differ on a number of variables, including maternal reports of social fear, NA, and attention span; teacher ratings of anxiety; child ratings of perceived competence; EEG alpha power; and respiratory sinus arrhythmia (Coplan et al, 2004;Henderson, Marshall, Fox, & Rubin, 2004).…”