Robert A. Schug

Frontal information flow and connectivity in psychopathy

Despite accumulating evidence of structural deficits in individuals with psychopathy, especially in frontal regions, our understanding of systems-level disturbances in cortical networks remains limited. We applied novel graph theory-based methods to assess information flow and connectivity based on cortical thickness measures in 55 individuals with psychopathy and 47 normal controls. Compared with controls, the psychopathy group showed significantly altered interregional connectivity patterns. Furthermore, bilateral superior frontal cortices in the frontal network were identified as information flow control hubs in the psychopathy group in contrast to bilateral inferior frontal and medial orbitofrontal cortices as network hubs of the controls. Frontal information flow and connectivity may have a significant role in the neuropathology of psychopathy.

Somatic aphasia: mismatch of body sensations with autonomic stress reactivity in psychopathy.

BACKGROUND Although one of the main characteristics of psychopaths is a deficit in emotion, it is unknown whether they show a fundamental impairment in appropriately recognizing their own body sensations during an emotion-inducing task. METHOD Skin conductance and heart rate were recorded in 138 males during a social stressor together with subjective reports of body sensations. Psychopathic traits were assessed using the Psychopathy Checklist-Revised (PCL-R) 2nd edition (Hare, 2003). RESULTS Nonpsychopathic controls who reported higher body sensations showed higher heart rate reactivity, but this verbal-autonomic consistency was not found in psychopathic individuals. This mind-body disconnection is particularly associated with the interpersonal-affective factor of psychopathy. CONCLUSIONS Findings are the first to document this body sensation-autonomic mismatch in psychopaths, and suggest that somatic aphasia - the inaccurate identification and recognition of ones own somatic states - may partly underlie the interpersonal-affective features of psychopathy.

Resting EEG deficits in accused murderers with schizophrenia.

Empirical evidence continues to suggest a biologically distinct violent subtype of schizophrenia. The present study examined whether murderers with schizophrenia would demonstrate resting EEG deficits distinguishing them from both non-violent schizophrenia patients and murderers without schizophrenia. Resting EEG data were collected from five diagnostic groups (normal controls, non-murderers with schizophrenia, murderers with schizophrenia, murderers without schizophrenia, and murderers with psychiatric conditions other than schizophrenia) at a brain hospital in Nanjing, China. Murderers with schizophrenia were characterized by increased left-hemispheric fast-wave EEG activity relative to non-violent schizophrenia patients, while non-violent schizophrenia patients instead demonstrated increased diffuse slow-wave activity compared to all other groups. Results are discussed within the framework of a proposed left-hemispheric over-processing hypothesis specific to violent individuals with schizophrenia, involving left hemispheric hyperarousal deficits, which may lead to a homicidally violent schizophrenia outcome.

Structural and psychosocial correlates of birth order anomalies in schizophrenia and homicide.

Birth order—a unique index of both neurodevelopmental and/or psychosocial factors in the pathogenesis of psychiatric disorder—remains largely unexplored in violent schizophrenia. We examined whether murderers with schizophrenia would demonstrate birth order anomalies, distinguishing them from both nonviolent schizophrenia patients and murderers without schizophrenia. Self-report birth order, psychosocial history data (i.e., maternal birth age, family size, parental criminality, parental SES), and structural magnetic resonance imaging data were collected from normal controls, nonviolent schizophrenia patients, murderers with schizophrenia, murderers without schizophrenia, and murderers with psychiatric conditions other than schizophrenia at a brain hospital in Nanjing, China. Results indicated that murderers with schizophrenia were characterized by significantly increased (i.e., later) birth order compared with both nonviolent schizophrenia patients and murderers without schizophrenia. Additionally, birth order was negatively correlated with gray matter volume in key frontal subregions for schizophrenic murderers, and was negatively correlated with parental SES. Findings may suggest biological, psychosocial, or interactional trajectories which may lead to a homicidally violent outcome in schizophrenia.

The Biology of Childhood Crime and Antisocial Behavior

Research into the biological underpinnings of antisocial behavior has not only been increasingly integrated into criminological research, but has also expanded its scope to focus on antisocial behavior that develops during childhood. Many of the biological risk factors that are associated with antisocial behavior during adulthood have also been found to characterize young antisocials. Structural and functional brain imaging studies have implicated several brain regions in the development of antisocial behavior in children, including the amygdala, the ventromedial prefrontal cortex, and the temporal region. Neuropsychological studies indicate that antisocial children display multiple behavioral indices of brain dysfunction, including executive dysfunction and IQ deficits. Psychophysiological studies have revealed that antisocial children are characterized by underarousal and diminished responses to stimuli and stressors. Early health factors, including minor physical anomalies and prenatal nicotine exposure, both independently and in interaction with social risk factors are associated with antisocial behavior in children. Future research should focus on incorporating a life-course criminological perspective into the study of the biology of childhood crime and antisocial behavior. Longitudinal studies that measure both biological and social risk factors over time will be critical to advancing our understanding of the development of antisocial behavior both during childhood and throughout the life-course.

Schizophrenia and Matricide: An Integrative Review

Though a modest number of studies dating back several decades have addressed a possible relationship between schizophrenia and matricide, or mother-killing, this literature to date remains largely unintegrated and findings have yet to be aggregated in any meaningful way. To address this, a qualitative review of studies related to both schizophrenia and matricide was conducted. Sixty-one publications were identified, consisting of case reports, descriptive studies, and comparison studies. Results indicated variable rates across studies of schizophrenia and other psychotic disorders among samples of matricidal offenders, though these rates appeared to be elevated in comparison to base rates of schizophrenia in the general population. Additionally, matricidal offenders with and without schizophrenia were in many cases characterized by negative family dynamics, pathological relationships with their mothers, and excessive offense violence. Though only limited generalizations can be made from qualitative synthesis of the literature in its current state, future investigations could lead to the establishment of a schizophrenia—matricide relationship which could have important implications in research, treatment, and criminal investigative areas of forensic psychology.

Chapter 10 - Neurocriminology

In the past several decades there has been an explosion of research into the biological correlates to antisocial behavior. This chapter reviews the state of current research on the topic, including a review of the genetics, neuroimaging, neuropsychological, and electrophysiological studies in delinquent and antisocial populations. Special attention is paid to the biopsychosocial model and gene–environment interactions in producing antisocial behavior.

Associations between psychopathic traits and brain activity during instructed false responding

Lying is one of the characteristic features of psychopathy, and has been recognized in clinical and diagnostic descriptions of the disorder, yet individuals with psychopathic traits have been found to have reduced neural activity in many of the brain regions that are important for lying. In this study, we examine brain activity in sixteen individuals with varying degrees of psychopathic traits during a task in which they are instructed to falsify information or tell the truth about autobiographical and non-autobiographical facts, some of which was related to criminal behavior. We found that psychopathic traits were primarily associated with increased activity in the anterior cingulate, various regions of the prefrontal cortex, insula, angular gyrus, and the inferior parietal lobe when participants falsified information of any type. Associations tended to be stronger when participants falsified information about criminal behaviors. Although this study was conducted in a small sample of individuals and the task used has limited ecological validity, these findings support a growing body of literature suggesting that in some contexts, individuals with higher levels of psychopathic traits may demonstrate heightened levels of brain activity.

Psychopathy moderates the relationship between orbitofrontal and striatal alterations and violence : The investigation of individuals accused of homicide

Brain structural abnormalities in the orbitofrontal cortex (OFC) and striatum (caudate and putamen) have been observed in violent individuals. However, a uni-modal neuroimaging perspective has been used and prior findings have been mixed. The present study takes the multimodal structural brain imaging approaches to investigate the differential gray matter volumes (GMV) and cortical thickness (CTh) in the OFC and striatum between violent (accused of homicide) and non-violent (not accused of any violent crimes) individuals with different levels of psychopathic traits (interpersonal and unemotional qualities, factor 1 psychopathy and the expressions of antisocial disposition and impulsivity, factor 2 psychopathy). Structural Magnetic Resonance Imaging data, psychopathy and demographic information were assessed in sixty seven non-violent or violent adults. The results showed that the relationship between violence and the GMV in the right lateral OFC varied across different levels of the factor 1 psychopathy. At the subcortical level, the psychopathy level (the factor 1 psychopathy) moderated the positive relationship of violence with both left and right putamen GMV as well as left caudate GMV. Although the CTh findings were not significant, overall findings suggested that psychopathic traits moderated the relationship between violence and the brain structural morphology in the OFC and striatum. In conclusion, psychopathy takes upon a significant role in moderating violent behavior which gives insight to design and implement prevention measures targeting violent acts, thereby possibly mitigating their occurrence within the society.

Alexithymia and reactive aggression: The role of the amygdala

Past research suggests an association between reactive aggression and alexithymia, but neural mechanisms underlying this association remain unknown. Furthermore, the relationship between proactive aggression and alexithymia remains untested. This study aimed to: (1) test whether alexithymia is more related to reactive than proactive aggression; and (2) determine whether amygdala, insula, and/or anterior cingulate cortical (ACC) volume could be neurobiological mechanisms for this association. One hundred and fifty-six community males completed the Reactive-Proactive Aggression Questionnaire and the Toronto Alexithymia Scale. Amygdala, insula, and ACC volumes were assessed using MRI. Alexithymia was positively associated with reactive but not proactive aggression. Alexithymia was positively and bilaterally associated with amygdala and anterior cingulate volumes. Reactive aggression was positively associated with right amygdala volume. Controlling for right amygdala volume rendered the alexithymia-reactive aggression relationship non-significant. Results suggest that increased right amygdala volume is a common neurobiological denominator for both alexithymia and reactive aggression. Findings suggest that greater right hemisphere activation may reflect a vulnerability to negative affect, which in turn predisposes to experiencing negative emotions leading to increased aggression. Findings are among the first to explicate the nature of the alexithymia-aggression relationship, with potential clinical implications.