Childhood Trauma Predicts Sadistic Traits and Violent Behavior in Incarcerated Youth.

Childhood trauma exposure is prevalent among incarcerated youth and associated with antisocial traits and behavior. It has been proposed as a risk factor for the development of sadistic traits, which has been shown to predict future violence in youth. Using regression analyses, we examined the association between self-report and expert-rated measures of childhood trauma, sadistic traits (i.e., verbal, physical, vicarious sadism), and violence (i.e., homicide and non-homicide violent acts) in 54 incarcerated juveniles. Expert-rated (but not self-report) severity of physical abuse was associated with physical and vicarious sadistic traits. Other trauma types (e.g., emotional or sexual abuse) were not significantly associated with sadistic traits. Physical abuse coupled with vicarious sadistic traits conferred the highest risk of non-homicide violence. The findings support and clarify links between childhood trauma, sadistic traits, and violent behavior in youth, and are distinct from those found in other antisocial profiles.

Neural networks underlying implicit and explicit moral evaluations in psychopathy.

Psychopathy, characterized by symptoms of emotional detachment, reduced guilt and empathy and a callous disregard for the rights and welfare of others, is a strong risk factor for immoral behavior. Psychopathy is also marked by abnormal attention with downstream consequences on emotional processing. To examine the influence of task demands on moral evaluation in psychopathy, functional magnetic resonance imaging was used to measure neural response and functional connectivity in 88 incarcerated male subjects (28 with Psychopathy Checklist Revised (PCL-R) scores ⩾ 30) while they viewed dynamic visual stimuli depicting interpersonal harm and interpersonal assistance in two contexts, implicit and explicit. During the implicit task, high psychopathy was associated with reduced activity in the dorsolateral prefrontal cortex and caudate when viewing harmful compared with helpful social interactions. Functional connectivity seeded in the right amygdala and right temporoparietal junction revealed decreased coupling with the anterior cingulate cortex (ACC), anterior insula, striatum and ventromedial prefrontal cortex. In the explicit task, higher trait psychopathy predicted reduced signal change in ACC and amygdala, accompanied by decreased functional connectivity to temporal pole, insula and striatum, but increased connectivity with dorsal ACC. Psychopathy did not influence behavioral performance in either task, despite differences in neural activity and functional connectivity. These findings provide the first direct evidence that hemodynamic activity and neural coupling within the salience network are disrupted in psychopathy, and that the effects of psychopathy on moral evaluation are influenced by attentional demands.