In his research, Komisaruk has used a functional magnetic resonance imaging machine (fMRI) to monitor what happens in the brain during climax. "What we see is a very widespread increase in the functional brain activity at orgasm," says Komisaruk. "So, if there's an overall increase in blood flow and oxygen utilization that is probably good for the brain." The blood flow reactions Komisaruk observed indicate that orgasms bring extra nutrients and oxygen to the brain. The mental exercises some people do to train their brains are often intended to increase this type of brain activity but orgasm seems to do it in a larger portion of the brain.