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It seems we may all be vulnerable to moral illusions the ethical equivalent of the bending lines that trick the eye on cereal boxes and in psychology textbooks. Illusions are a favorite tool of perception scientists for exposing the workings of the five senses, and of philosophers for shaking people out of the naïve belief that our minds give us a transparent window onto the world (since if our eyes can be fooled by an illusion, why should we trust them at other times?). Today, a new field is using illusions to unmask a sixth sense, the moral sense.

The first hallmark of moralization is that the rules it invokes are felt to be universal. Prohibitions of rape and murder, for example, are felt not to be matters of local custom but to be universally and objectively warranted. One can easily say, “I don’t like brussels sprouts, but I don’t care if you eat them,” but no one would say, “I don’t like killing, but I don’t care if you murder someone.”The other hallmark is that people feel that those who commit immoral acts deserve to be punished.

Until recently, it was understood that some people didn’t enjoy smoking or avoided it because it was hazardous to their health. But with the discovery of the harmful effects of secondhand smoke, smoking is now treated as immoral. Smokers are ostracized; images of people smoking are censored; and entities touched by smoke are felt to be contaminated (so hotels have not only nonsmoking rooms but nonsmoking floors). The desire for retribution has been visited on tobacco companies, who have been slapped with staggering “punitive damages.” At the same time, many behaviors have been amoralized, switched from moral failings to lifestyle choices.

Fear, arriving in layers in which genetic legacy converges with personal experience, is vital to our survival. When we freeze, stop in our tracks or take flight, it is a biological response to what we sense as near and present danger. All the same, it observes its own absurd hierarchy, in which we often harbor an abiding anxiety for the wrong things.

Except that we do choose, and what we choose are generally the ordinary fears such as heights, public speaking, insects, reptiles

The biologist E. O. Wilson has observed that while we fear snakes, spiders, darkness, open spaces and closed spaces, we do not fear the more likely instruments of danger — knives, guns, cars, electrical sockets — because, he says, “our species has not been exposed to these lethal agents long enough in evolutionary time to have acquired the predisposing genes that ensure automatic avoidance.” Which is to say, fear, real fear, deep fear, the kind that changes our habits and actions, is not something on which we are likely to follow sensible instruction.

In the nineteen-eighties, Allan Rechtschaffen and Bernard Bergmann, both, like Kleitman, sleep researchers at the University of Chicago, performed what is now considered to be one of the classic experiments in the field. It showed that rats, when totally deprived of sleep, would, after two or three weeks, drop dead. But Rechtschaffen and Bergmann could never figure out the precise cause of the rats’ deaths, and so, they wrote in a follow-up paper in 2002, even “that dramatic symptom did not tell us much about why sleep was necessary.” Rechtschaffen has observed that “if sleep doesn’t serve an absolutely vital function, it is the greatest mistake evolution ever made.”

Peter Godfrey-Smith, the author of “Theory and Reality: An Introduction to the Philosophy of Science,” has been thinking about how people can avoid the misunderstanding embedded in the phrase, “It’s only a theory.” Advertisement Continue reading the main story It’s helpful, he argues, to think about theories as being like maps.“To say something is a map is not to say it’s a hunch,” said Dr. Godfrey-Smith, a professor at the City University of New York and the University of Sydney. “It’s an attempt to represent some territory.”A theory, likewise, represents a territory of science. Instead of rivers, hills, and towns, the pieces of the territory are facts.“To call something a map is not to say anything about how good it is,” Dr. Godfrey-Smith added. “There are fantastically good maps where there’s not a shred of doubt about their accuracy. And there are maps that are speculative.”To judge a map’s quality, we can see how well it guides us through its territory. In a similar way, scientists test out new theories against evidence. Just as many maps have proven to be unreliable, many theories have been cast aside.But other theories have become the foundation of modern science, such as the theory of evolution, the general theory of relativity, the theory of plate tectonics, the theory that the sun is at the center of the solar system, and the germ theory of disease.“To the best of our ability, we’ve tested them, and they’ve held up,” said Dr. Miller. “And that’s why we’ve held on to these things.”

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