Word: triggers
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Such concerns have revived the worldwide call, even from some very senior generals and admirals, to abolish nuclear weapons. But a large part of the risk could be eliminated by the less radical step of "de-alerting" the forces, taking them off their hair-trigger posture. Since there is no political reason to think war is around the corner, why not make it impossible to fire the missiles without a great deal of time-consuming preparation...
...heart attack. During a fierce fire fight in which Lieut. Raul Jimenez Salazar was killed, another hostage, Agriculture Minister Rodolfo Munante Sanguinetti, had a close call. A guerrilla dashed into the room where he was hiding with several others and raised his rifle. But he did not pull the trigger. "He just left without shooting or lobbing a grenade at us," Munante recalled. "I got the impression the boy suddenly felt bad about what he and the rebels had done." Fujimori, his voice breaking, praised Jimenez later for his leadership, saying, "He was the first to open...
...since, evidence linking dopamine to drugs has mounted. Amphetamines stimulate dopamine-producing cells to pump out more of the chemical. Cocaine keeps dopamine levels high by inhibiting the activity of a transporter molecule that would ordinarily ferry dopamine back into the cells that produce it. Nicotine, heroin and alcohol trigger a complex chemical cascade that raises dopamine levels. And a still unknown chemical in cigarette smoke, a group led by Brookhaven chemist Joanna Fowler reported last year, may extend the activity of dopamine by blocking a mopping-up enzyme, called MAO B, that would otherwise destroy...
...degree to which learning and memory sustain the addictive process is only now being appreciated. Each time a neurotransmitter like dopamine floods a synapse, scientists believe, circuits that trigger thoughts and motivate actions are etched onto the brain. Indeed, the neurochemistry supporting addiction is so powerful that the people, objects and places associated with drug taking are also imprinted on the brain. Stimulated by food, sex or the smell of tobacco, former smokers can no more control the urge to light up than Pavlov's dogs could stop their urge to salivate. For months Rafael Rios lived in fear...
...behind the bridge of the nose. Other scientists had already shown that this section of the brain, called the subgenual prefrontal cortex, plays an important role in the control of emotions. But Drevets, who has since moved to the University of Pittsburgh, discovered that it could also be the trigger point for both bouts of paralyzing sadness and the wildly euphoric highs of manic depression. "This area of the brain may act as a set of brakes for emotional responses," he explains. "When it does not function properly, abnormal swings in mood may occur...