Objectives To discover whether post-combat syndromes have existed after modern wars and what relation they bear to each other.

Although this study raises questions about changing interpretations of post-traumatic illness, it supports the hypothesis that some of the characteristics of PTSD are culture-bound. Earlier conflicts showed a greater emphasis on somatic symptoms.

No abstract

The US and British armies have faced intelligent and adaptive enemies in Iraq and continue to do so in Afghanistan. While both armies have proved adept at fighting high‐intensity conflict, their initial performance against asymmetric threats and diffuse insurgencies in Iraq and Afghanistan demonstrated how much each army had to learn about conducting counterinsurgency operations. This article examines one important means by which the US and British armies have transformed themselves into more flexible and responsive organizations that are able to harness innovation at the front effectively. It traces the development of the lessons‐learned systems in both armies from the start of counterinsurgency operations in Iraq to today. These changes have resulted in significant development within the organization of both armies. Reform of US and British army learning capabilities offers an important insight into the drivers of military change. The reformed lessons‐learned systems have been better integrated into training, experimentation, and doctrine and force development. While there are still challenges to be overcome, both armies have created robust structures that facilitate the movement of knowledge from recent experience at the front to the rest of the organization. As such, these reforms provide us with a useful case‐study that enhances our understanding of the role of ‘bottom‐up’ initiatives in military innovation.

Two experiments on rats tested predictions of a Pavlovian conditioning model of drug tolerance which holds that tolerance is the result of compensatory conditioned responses, developed to environmental stimuli accompanying the drug administrations, which attenuate the direct effects of the drug. In Experiment I, the acquisition of tolerance-modulating properties by the tone component of a tone-light compound stimulus which accompanied morphine administrations was reduced by prior light-morphine pairings (blocking). In Experiment II, a tone stimulus acquired tolerance-modulating properties through prior pairings with a light stimulus which later accompanied morphine administrations (sensory preconditioning). These findings are uniquely predicted by the Pavlovian conditioning model of drug tolerance and are incompatible with traditional theories which assign no role to environmental stimuli present at the time of drug administration.