Part 1/11 Playlist: www.youtube.com -------- SPEAKERS: Alexander Shulgin: Pharmacologist and Chemist Christof Koch: Lois and Victor Troendle Professor of Cognitive and Behavioral Biology, California Institute of Technology Koch at Cal Tech Patricia Churchland: Professor of Philosophy, University of California, San Diego Ira Flatow, MODERATOR: Host/Executive Producer, Talk of the Nation: Science Friday Flatow's NPR profile ABOUT THE LECTURE: At some point, these panelists suggest, the issue of defining consciousness may just disappear. Suggests Christof Koch: "Let's treat consciousness as an empirical problem to be tackled by the biological sciences." Koch makes distinctions between different kinds of consciousness: sleep and its varied stages; awareness of sounds, sights and smells; levels of arousal. All these different states are properties "of complex adaptive networks with massive feedback shaped by natural selection." And there are many behaviors that occur without consciousness. "When we talk, we don't know what we're going to say," says Koch. His research has focused on finding "neural correlates of consciousness." In one experiment with patients whose brains were implanted with 100 electrodes, he flashed pictures of Jennifer Aniston and the Sydney Opera House. While the patients could not remember what they'd seen, neurons responded selectively to these images. Studies like this, with even more sensitive tools, may some day help develop an information-based theory <b>...</b>