"We are finding more scientific differences between men and women as we improve research methods and broaden study populations," said study co-author Dr. Emeran Mayer, UCLA professor of bio-behavioral sciences, and medicine, physiology and psychiatry. "This growing base of research will help us develop more effective treatments based on a new criteria: gender."
Dr. Mayer is the director of the new Center for Neurovisceral Sciences & Women's Health (CNS) at UCLA, which conducted the study.
Published in the June 2003 issue of the journal Gastroenterology, the study examined 26 women and 24 men with IBS. UCLA researchers took positron emission tomography (PET) brain scans of patients during mild pain stimuli.
Although researchers found some overlapping areas of brain activation in men and women, several areas of male and female brains reacted differently when given the same pain stimulus. The female brain showed greater activity in limbic regions, which are emotion-based centers. In men, the cognitive regions, or analytical centers, showed greater activity.
"The reason for the two different brain responses may date back to primitive days, when the roles of men and women were more distinct," said study co-author Dr. Bruce Naliboff, UCLA clinical professor of psychiatry and biobehavioral sciences, and co-director of CNS.
According to Naliboff, these gender differences in brain responses to pain may have evolved as part of a more general difference in stress responses between men and women. Men's cognitive areas may be more highly tr
Contact: Rachel Champeau
University of California - Los Angeles