Climbers are understandably leery of such explanations. They admit that they may be more inclined to take risks than the average human. But that inclination's ultimate expression, they argue, is largely a matter of personal volition. "At some level, there is a reason, chemical, mechanical, or whatever, for why we climb. But doesn't that take the 'human' element out of it, and make us all robots?" grouses Todd Wells, a 40-year-old climber from Chattanooga. "I climb so I don't feel like a robot, so I feel like I'm doing something that is motivated by the 'self.'"

Even physiologically oriented scientists like Zuckerman admit the dopamine reaction is only part of the risk-taking picture. Upbringing, personal experience, socio-economic status, and learning are all crucial in determining how that risk-taking impulse is ultimately expressed.

CULTURE OF ASCENT

Although many climbers report a childhood preference for thrills, their interest in climbing was often shaped externally, either through contact with older climbers or by reading about great expeditions. Upon entering the sport, novices are often immersed in a tight-knit climbing subculture, with its own lingo, rules of conduct, and standards of excellence.

This learned aspect may be the most important element in the formation of the high-sensation seeking personality. While risk taking may have arisen from neurochemicals and environmental influences, there is an intellectual or conscious side to it that is now not only distinct from them but is itself a powerful motivator. Working through a challenging climbing route, for example, generates a powerful sense of competence that can also provide climbers with a new-found confidence in their everyday life. "There is nothing more empowering than taking a risk and succeeding," says Farley.

No wonder scaling the face of a cliff is a potent act that can penetrate to the very essence of self and help reshape it. Many climbers report using that empowering dynamic to overcome some of their own inner obstacles. Among these, fear--of heights, of loss of control, of death--is the most commonly cited.

Richard Gottlieb, 42-year-old climber from New York, is known for climbing frozen waterfalls, one of the riskiest facets of the sport. But as a kid, he was too scared even to go to summer camp. "Yet there was something in me that wanted to get into some swashbuckling adventure," he says. Climbing satisfied that impulse while helping him overcome his fearful nature. Gottlieb believes climbing has helped him cope with his fear of death: "We open the door, see the Grim Reaper right there, but instead of just slamming the door, you push him back a few steps."

NEW OUTLETS

Traditional outlets for the risk-taking impulse have been disappearing from everyday life. As civilization steadily minimized natural risks, Aptor says, and as cultures have sought to maintain their hard-won stability through repressive laws and stifling social mores, risk takers have been forced to devise new outlets. In the 20th century, that has brought about a rise in thrill sports. But Aptor believes the tension between civilization and risk taking dates back eons. Aptor wonders how much of the British Empire "was built up by people trying to escape the desperately conformist society of Victorian England."

When channeled into sports like climbing, where skill and training can minimize danger, or into starting a new business, risk taking may continue to be a healthy psychological outlet. It may provide a means to cope with boredom and modern anxieties, to bolster self-esteem. Risk taking may provide a crucial sense of control in a period where so much of what happens--from crime and auto accidents to environmental disasters and economic downturns--seems almost random.

Unfortunately, the risk taking impulse doesn't always find such healthy outlets. Many high-sensation seekers don't have the money or the role models for sky diving or rock climbing, Zuckerman notes. "In such groups, the main forms of sensation seeking include sex, drugs, heavy drinking, gambling, and reckless driving." Indeed, sensation seeking may emerge as a critical factor in crime. No surprise, then, that some researchers place the risk taking personality in the "abnormal" category and regard high-risk takers almost as an evolutionarily obsolete subspecies. Maddi suggests that well-adjusted people are "good at turning everyday experience into something interesting. My guess is that the safecracker or the mountain climber can't do that as well. They have to do something exciting to get a sense of vitality. It's the only way they have of getting away from the sense that life sucks." Larsen is even blunter: "I think risk takers are a little sociopathic."

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