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  3. The Psychology and Physiology of Taking Risks Why do only some of us become risk-seekers? There must be factors at work, whi

The Psychology and Physiology of Taking Risks Why do only some of us become risk-seekers? There must be factors at work, whi

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问题                 The Psychology and Physiology of Taking Risks
    Why do only some of us become risk-seekers? There must be factors at work, which is experienced by risk-seekers and by risk-avoiders alike.

    On a very simple level, social rewards are high for risk-takers who triumph over adversity. The scientist who does cutting-edge research despite the possibility of ruining his or her career may discover the next great energy source or the long-sought cure for a disease. The civil rights leader who perseveres in the face of threats to life or family may open new doors for millions of downtrodden citizens.
    Charles Lindbergh, the postal-service pilot who focused the attention of many nations on the possibilities of long-distance flight, attained immense wealth and fame. The risk-seeker, in other words, may simply be a very goal-directed person willing to take great chances to win big rewards.
    Psychologists often mention the sense of control that surviving a dangerous situation can impart. There is a great payoff for some people in facing adversity and overcoming it through superior strength and preparation. By this schema(模式), a risk-taker is not someone who recklessly seeks trouble but someone who carefully matches himself or herself against a worthy challenge. This image fits such extreme athletes as mountain-climbers or skydivers, who spend a great deal of time preparing for a dangerous ascent or a challenging jump. It does not, however, fit the teenager who recklessly speeds down a highway or the inexperienced skier who decides to take on a black-diamond slope. What explains risk-taking of this sort, which is probably best characterised as impulsive behaviour?

    Psychologists in the Freudian mold would bring up the concept of a " death wish," a deep-seated impulse to flirt with personal annihilation(灭绝). Physiologists pose several more-convincing possibilities. The tendency to be a risk-seeker depends, in this view, on factors such as one’s brain development or one’s receptivity to common brain chemicals. For example, studies of electrical patterns in the brain have shown that teenagers, as opposed to preteens and adults, exhibit more activities in the reward centres of their brains than in the planning centres. Furthermore, these reward centres are most active when the rewards appear unpredictably. This focus on instant rewards and on novelty offers a recipe for impulsive risk-taking in hopes of a chance pay-out.
    Another possible factor is an enzyme called monoamine oxidase(MAO). It helps control the levels of dopamine and other chemicals in the brain so that someone whose body produces abnormally little MAO is likely to have imbalances of such chemicals in the brain. By testing individuals with a tendency toward risky behaviour, researchers have established a strong correlation between low levels of MAO and living dangerously.
Why do only some of us become risk-seekers? Firstly, social rewards are high for risk-takers who【R1】______. The risk-seekers may simply be a very【R2】______person willing to take great chances to gain big rewards. Secondly, there is a great payoff for some people in facing adversity and overcoming it through great【R3】______. The third factor is a death wish. The tendency to be a risk-seeker depends, in the Freudian mold, on factors such as one’s brain development or one’s receptivity to common brain chemicals. Teenagers have been shown to exhibit more activities in the【R4】______of one’s brains than in the planning centres. The last possible factor is MAO, which helps control the levels of dopamine and other chemicals in the brain so that someone whose body produces low levels of MAO is likely to have imbalances of such chemicals in the brain.【R5】______between low levels of MAO and living dangerously has been established.
【R4】
选项
答案reward centres
解析 (参见第四段倒数第三句话teenagers，as opposed to preteens and adults，exhibit more activities in the reward centres of their brains than in the planning centres．)
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