Is ‘Do Unto Others’ Written Into Our Genes?
Many people will say it is morally acceptable to pull a switch that diverts a train, killing just one person instead of the five on the other track. But if asked to save the same five lives by throwing a person in the train’s path, people will say the action is wrong. This may be evidence for an ancient subconscious morality that deters causing direct physical harm to someone else. An equally strong moral sanction has not yet evolved for harming someone indirectly.
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Where do moral rules come from? From reason, some philosophers say. From God, say believers. Seldom considered is a source now being advocated by some biologists, that of evolution.
At first glance, natural selection and the survival of the fittest may seem to reward only the most selfish values. But for animals that live in groups, selfishness must be strictly curbed or there will be no advantage to social living. Could the behaviors evolved by social animals to make societies work be the foundation from which human morality evolved?
In a series of recent articles and a book, “The Happiness Hypothesis,” Jonathan Haidt, a moral psychologist at the University of Virginia, has been constructing a broad evolutionary view of morality that traces its connections both to religion and to politics.
Dr. Haidt (pronounced height) began his research career by probing the emotion of disgust. Testing people’s reactions to situations like that of a hungry family that cooked and ate its pet dog after it had become roadkill, he explored the phenomenon of moral dumbfounding — when people feel strongly that something is wrong but cannot explain why.
Dumbfounding led him to view morality as driven by two separate mental systems, one ancient and one modern, though the mind is scarcely aware of the difference. The ancient system, which he calls moral intuition, is based on the emotion-laden moral behaviors that evolved before the development of language. The modern system — he calls it moral judgment — came after language, when people became able to articulate why something was right or wrong.
The emotional responses of moral intuition occur instantaneously — they are primitive gut reactions that evolved to generate split-second decisions and enhance survival in a dangerous world. Moral judgment, on the other hand, comes later, as the conscious mind develops a plausible rationalization for the decision already arrived at through moral intuition.
Moral dumbfounding, in Dr. Haidt’s view, occurs when moral judgment fails to come up with a convincing explanation for what moral intuition has decided.
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