Narrator: This is Science Today. Researchers now have concrete data that the brain, namely the frontal cerebral cortex, has a lot to do with regulating the immune system. Neuroscientist Marian Diamond, of the University of California, Berkeley says her laboratory findings offer much hope in the future treatment of illness.
Diamond: We can save hundreds of billions of dollars of people having all this medical care, if they can learn to control their own immune systems and keep healthy.
Narrator: Diamond's findings directly linked the frontal cortex to the thymus gland, which produces germ-fighting T-cells. Researchers have long suspected such a link .
Diamond: When people get depressed, they get sick. We've shown this and we've shown that if we have animals living in enriched environments with lots of objects to play with, lots of friends, the cortex increases. so they're ways in which we've got a big picture in what we're doing, but we're trying to get a biological mechanism for what has been known for centuries.
Narrator: For Science Today, I'm Larissa Branin.