A comparison of memory for homicide, non-homicidal violence, and positive life experiences

Defendants commonly claim amnesia for their criminal actions especially in cases involving extreme violence. While some claims are malingered or result from physiological factors, other cases may represent genuine partial or complete amnesia resulting from the psychological distress and/or extreme emotion associated with the perpetration of the crime. Fifty Canadian homicide offenders described their memories of their homicide, a non-homicide violent offense, and their most positive adulthood life experience. Self-reported and objective measures of memories for these events revealed that homicides were recalled with the greatest level of detail and sensory information. Although dissociative tendencies were associated with a self-reported memory loss, objective measures of memory quality did not reflect this perceived impairment, suggesting a failure of meta-memory. Recollections of positive life events were superior to those of non-homicidal violence, possibly due to greater impact and meaning attached to such experiences. Findings suggest that memory for homicide typically is enhanced by the powerful emotion associated with its perpetration.     

Functional Neuroimaging of Symptom Validity Testing in Traumatic Brain Injury

The Word Memory Test (WMT) is a commonly used symptom validity test (SVT) that assesses recognition verbal memory. The task has been adapted for use within a functional magnetic resonance imaging (fMRI) paradigm so the neural correlates of WMT activation patterns can be studied. In the current investigation, performance on the delayed recognition subtest of the WMT was examined in two patients who sustained severe TBI and compared to ten healthy controls. The patients underwent comprehensive neuropsychological evaluations and structural MRI. All participants completed two versions of the WMT: full-effort and simulated poor effort conditions. Despite extensive structural brain damage, the fMRI activation patterns during full-effort WMT performance were somewhat similar in the two TBI patients and likewise, somewhat similar to controls. The fMRI activation pattern in both patients demonstrated intact activation of the basic neural structures necessary to perform the WMT. Dissimilar patterns of activation were obtained during the simulated poor effort condition of WMT performance suggesting that fMRI techniques may be sensitive in demonstrating non-credible cognitive performance. The results of our study represent the first fMRI investigation of normal and simulated poor effort SVT performance in individuals with documented brain damage. The implications of fMRI techniques in SVT research and their clinical application are discussed.     

Courting His Majesty: USAED in King Hassan's Morocco

Thus history suggests that dictators come in two types: one whose personal objectives often conflict with [economic] growth promotion and another whose interests dictate a preoccupation with economic development. The theory that determines which kind of dictatorship will prevail is missing. Absent this theory, the choice of a dictatorship can be viewed as a risky investment; economic outcomes may be very good or very bad but are surely uncertain