Figure (IMAGE) University of Tsukuba Caption Researchers from the University of Tsukuba discovered a novel mechanism by which the brain regulates the cardiovascular system in response to stress. By electrically stimulating the lateral habenula, the researchers found that it regulates heart rate and blood pressure via the autonomic nervous system. They then showed that this effect depends on specific receptor subtypes of the neurotransmitter serotonin. This study demonstrates the mechanism by which the brain elicits physiologic effects in response to stress. Credit University of Tsukuba Usage Restrictions Unauthorized use is prohibited License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.