Evidence continues to accumulate that the brain rewards certain behaviors and that we respond to those incentives. The Washington Post reports:
The results were showing that when the volunteers placed the interests of others before their own, the generosity activated a primitive part of the brain that usually lights up in response to food or sex. Altruism, the experiment suggested, was not a superior moral faculty that suppresses basic selfish urges but rather was basic to the brain, hard-wired and pleasurable.These results turn previous brain chemistry arguments about homosexuality on their head.
Their 2006 finding that unselfishness can feel good lends scientific support to the admonitions of spiritual leaders such as Saint Francis of Assisi, who said, "For it is in giving that we receive." But it is also a dramatic example of the way neuroscience has begun to elbow its way into discussions about morality and has opened up a new window on what it means to be good.
The more researchers learn, the more it appears that the foundation of morality is empathy. Being able to recognize -- even experience vicariously -- what another creature is going through was an important leap in the evolution of social behavior. And it is only a short step from this awareness to many human notions of right and wrong, says Jean Decety, a neuroscientist at the University of Chicago.
The research enterprise has been viewed with interest by philosophers and theologians, but already some worry that it raises troubling questions. Reducing morality and immorality to brain chemistry -- rather than free will -- might diminish the importance of personal responsibility. Even more important, some wonder whether the very idea of morality is somehow degraded if it turns out to be just another evolutionary tool that nature uses to help species survive and propagate.
Joshua D. Greene, a Harvard neuroscientist and philosopher, said multiple experiments suggest that morality arises from basic brain activities. Morality, he said, is not a brain function elevated above our baser impulses. Greene said it is not "handed down" by philosophers and clergy, but "handed up," an outgrowth of the brain's basic propensities.
Marc Hauser, another Harvard researcher, has used cleverly designed psychological experiments to study morality. He said his research has found that people all over the world process moral questions in the same way, suggesting that moral thinking is intrinsic to the human brain, rather than a product of culture.
Compare these results to the strong evidence that sexual preference is hard wired. That, to my mind, is not an argument that homosexuality is moral; that argument has to be made on other grounds. Otherwise, we have given away the notion that we are responsible for any behaviors that are preference driven.
What about this evidence that moral decisionmaking is brain chemistry driven? It could be that the cultural and religious proscriptions of homosexuality have their roots in survival of the species through propogation. These mores do not fit today's world.