Reduction of PTSD in South African University Students Using Transcendental Meditation Practice.

A study was conducted on South African college students using the Transcendental Meditation technique to reduce posttraumatic stress disorder. Students meeting the criteria for possible posttraumatic stress disorder were included. Thirty-four students at the experimental university in South Africa clinically diagnosed with posttraumatic stress disorder were instructed in and practiced the Transcendental Meditation technique twice daily compared to 34 diagnosed posttraumatic stress disorder comparison students at the comparison university. The multivariate effect was significant for both the posttraumatic stress disorder symptomatology and depression. Results were significantly associated with regularity of practice. The study replicates recent findings and offers an alternative educational treatment for higher education.

Decisions to shoot in a weapon identification task: The influence of cultural stereotypes and perceived threat on false positive errors.

The decision to shoot a gun engages executive control processes that can be biased by cultural stereotypes and perceived threat. The neural locus of the decision to shoot is likely to be found in the anterior cingulate cortex (ACC), where cognition and affect converge. Male military cadets at Norwich University (N=37) performed a weapon identification task in which they made rapid decisions to shoot when images of guns appeared briefly on a computer screen. Reaction times, error rates, and electroencephalogram (EEG) activity were recorded. Cadets reacted more quickly and accurately when guns were primed by images of Middle-Eastern males wearing traditional clothing. However, cadets also made more false positive errors when tools were primed by these images. Error-related negativity (ERN) was measured for each response. Deeper ERNs were found in the medial-frontal cortex following false positive responses. Cadets who made fewer errors also produced deeper ERNs, indicating stronger executive control. Pupil size was used to measure autonomic arousal related to perceived threat. Images of Middle-Eastern males in traditional clothing produced larger pupil sizes. An image of Osama bin Laden induced the largest pupil size, as would be predicted for the exemplar of Middle East terrorism. Cadets who showed greater increases in pupil size also made more false positive errors. Regression analyses were performed to evaluate predictions based on current models of perceived threat, stereotype activation, and cognitive control. Measures of pupil size (perceived threat) and ERN (cognitive control) explained significant proportions of the variance in false positive errors to Middle-Eastern males in traditional clothing, while measures of reaction time, signal detection response bias, and stimulus discriminability explained most of the remaining variance.