In the brain, these thoughts can often be traced to overreactivity in the amygdala, a small site in the middle of the brain that, among its many other functions, responds to novelty and threat. When the amygdala works as it should, it orchestrates a physiological response to changes in the environment. That response includes heightened memory for emotional experiences and the familiar chest pounding of fight or flight. But in people born with a particular brain circuitry, the kind seen in Kagan’s high-reactive study subjects, the amygdala is hyperreactive, prickly as a haywire motion-detector light that turns on when nothing’s moving but the rain. Other physiological changes exist in children with this temperament, many of them also related to hyperreactivity in the amygdala. They have a tendency to more activity in the right hemisphere, the half of the brain associated with negative mood and anxiety; greater increases in heart rate and pupil dilation in response to stress; and on occasion higher levels of the stress hormones cortisol and norepinephrine.
thinkahol * on 16 Jun 1119-01-2011 Medical evidence has shown that long-term solitary confinement is a form of torture. Dr Joost J den Otter, Medical Director at the International Rehabilitation Council for Torture Victims (IRCT), adds that while there is no doubt about the damage caused by long periods of isolation, solitary confinement for a short period may also cause psychological harm. Dr den Otter highlights the fact that many qualitative and quantitative scientific studies have documented how solitary confinement in prison has damaging health effects. He asserts that the scientific debate on solitary confinement as a method of torture has been settled for many years, but that it seems there is still confusion among policy makers, prison authorities, and the general public. A recent commentary published by the Journal of the American Academy of Psychiatry and the Law about solitary confinement and mental illness in U.S. Prisons, the authors, Jeffrey L. Metzner and Jamie Fellner, support Dr den Otter's judgment. "Isolation can be psychologically harmful to any prisoner, with the nature and severity of the impact depending on the individual, the duration of confinement, and particular conditions (e.g., access to natural light, books, or radio). Psychological effects can include anxiety, depression, anger, cognitive disturbances, perceptual distortions, obsessive thoughts, paranoia, and psychosis". In August 2010, Physicians for Human Rights published a report (Experiments in Torture) which added to the growing body of evidence that solitary confinement causes psychological harm consistent with torture. In an interview with 'Life's Little Mysteries', Dr Scott Allen, one of the authors of the paper, said that solitary confinement "can lead to anxiety, depression, certainly disorientation, [and] it can even lead to thought disorders including psychotic thoughts." He added "The consequences can be significant." This backs up researcher Peter Scharff Smith, of The Danis
