时文阅读2

时文阅读2

Altruism（利他主义）, according to the text books, has two forms. One is known technically as kin selection, and familiarly as nepotism. This spreads an individual's genes collaterally, rather than directly, but is otherwise similar to his helping his own offspring. The second form is reciprocal altruism, or “you scratch my back and I'll scratch yours”. It relies on trust, and a good memory for favours given and received, but is otherwise not much different from simultaneous collaboration (such as a wolf pack hunting) in that the benefit exceeds the cost for all parties involved. Humans, however, show a third sort of altruism—one that has no obvious pay-off. This is altruism towards strangers, for example, charity. That may enhance reputation. But how does an enhanced reputation weigh in the Darwinian balance? To investigate this question, the researchers made an interesting link. At first sight, helping charities looks to be at the opposite end of the selfishness spectrum from conspicuous consumption. Yet they have something in common: both involve the profligate deployment of resources. That is characteristic of the consequences of sexual selection. An individual shows he (or she) has resources to burn—whether those are biochemical reserves, time or, in the human instance, money—by using them to make costly signals. That demonstrates underlying fitness of the sort favoured by evolution. Viewed this way, both conspicuous consumption and what the researchers call “blatant benevolence” are costly signals. And since they are behaviours rather than structures, and thus controlled by the brain, they may be part of the mating mind. Researchers divided a bunch of volunteers into two groups. Those in one were put into what the researchers hoped would be a “romantic mindset” by being shown pictures of attractive members of the opposite sex. They were each asked to write a description of a perfect date with one of these people. The unlucky members of the other group were shown pictures of buildings and told to write about the weather. The participants were then asked two things. The first was to imagine they had $5,000 in the bank. They could spend part or all of it on various luxury items such as a new car, a dinner party at a restaurant or a holiday in Europe. They were also asked what fraction of a hypothetical 60 hours of leisure time during the course of a month they would devote to volunteer work. The results were just what the researchers hoped for. In the romantically primed group, the men went wild with the Monopoly money. Conversely, the women