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Published online by Cambridge University Press: 10 April 2015
Decades of research have shown that youths with disruptive behavior disorders (DBD) are a heterogeneous population. Over the past 20 years, researchers have distinguished youths with DBD as those displaying high (DBD/HCU) versus low (DBD/LCU) callous-unemotional (CU) traits. These traits include flat affect and reduced empathy and remorse, and are associated with more severe, varied, and persistent patterns of antisocial behavior and aggression. Conduct problems in youths with HCU and LCU are thought to reflect distinct causal vulnerabilities, with antisocial behavior in youths with DBD/HCU reflecting a predominantly genetic etiology, while antisocial behavior in youths with DBD/LCU is associated primarily with environmental influences. Here we selectively review recent functional (fMRI) and structural (sMRI) magnetic resonance imaging research on DBD, focusing particularly on the role of CU traits. First, fMRI studies examining the neural correlates of affective stimuli, emotional face processing, empathy, theory of mind, morality, and decision-making in DBD are discussed. This is followed by a review of the studies investigating brain structure and structural connectivity in DBD. Next, we highlight the need to further investigate females and the role of sex differences in this population. We conclude the review by identifying potential clinical implications of this research.
Rosalind H. Baker and Roberta L. Clanton contributed equally to this work.
Rosalind Baker, Jack Rogers, and Stéphane De Brito are supported by the European Commission’s Seventh Framework Programme (FP7/2007–2013) under Grant Agreement no. 602407 (FemNAT-CD) (http://ec.europa.eu). Roberta Clanton is supported by a Ph.D. studentship from the College of Life and Environmental Sciences, University of Birmingham. Stéphane A. De Brito was supported by a research fellowship from the Swiss National Science Foundation (SNSF PA00P1_139586). We thank Dr. Graeme Fairchild for his comments on a previous version of the manuscript.