Dale Purves, the George Barth Gellor Professor for Research in Neurobiology, and director of the Center for Cognitive Neuroscience at Duke University will speak on Why We See What We Do: Brightness and Color" as part of the upcoming Snowdon Lecture Series. (Photo courtesy of Duke University) Posted 10/16/07 Upcoming lectures funded by the Edward W. Snowdon Fund focus on childrens book writing, the way human beings perceive brightness and color, and cognitive behavior as it relates to stress and health. For several years, the family of Edward W. Snowdon '33 has supported a variety of programs through the Edward…