This is why I appreciate science. This Vandy study says more about what humanity's real religion is than a hundred theology books could. And it matter-of-factly explains and predicts the tendencies of the human animal more reliably than, say, a Methodist minister could... or heck, even a Calvinist.
What I mean by this is that science can predict how every kind of religion in every era and every culture will be manipulated by the majority of its adherents to justify and sanctify the very forms of war, tribalism and oppression that its highest ideals shun.
Sure, a Calvinist may claim that his doctrine of human depravity predicts the same stuff about human nature that science predicts. But his religious exclusivism and triumphalism inevitably lead him in a far different direction, in which he will always take a far more charitable view of the overall impact of his religion and far less charitable view of the impact of rival religions. Science would predict that cognitive error on his part, but he will refuse to see it as an error.
From the article on the Vandy study:
"Aggression occurs among virtually all vertebrates and is necessary to get and keep important resources such as mates, territory and food," said study team member Craig Kennedy, professor of special education and pediatrics at Vanderbilt University in Tennessee. "We have found that the reward pathway in the brain becomes engaged in response to an aggressive event and that dopamine is involved."
For the experiments, the researchers placed a pair of mice, one male and one female, in a cage. Then, the female was removed and a so-called male intruder mouse entered the cage. That triggered aggressive behavior in the resident male. The tell-tale signs of aggression included tail rattle, an aggressive sideways stance, boxing and biting.
After the initial scuffle ended, the resident male mouse was trained to nose-poke a target to get the intruder to return. Results showed the home mouse consistently poked the target and fought with the introduced mouse, indicating, the researchers say, that the aggressive encounter was seen as a reward.
"We learned from these experiments that an individual will intentionally seek out an aggressive encounter solely because they experience a rewarding sensation from it," Kennedy said.
To figure out whether the brain's reward pathway was involved, the scientists treated the home mice with a drug to block dopamine in certain parts of the brain known to be involved in rewards like food and drugs....
Kennedy explained that the experiments have implications for humans. The reward pathway in the brains of humans and mice are very similar, he said.
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