It's baaaack. … Whether you're scared of brain-eating zombies or evil clowns, Halloween is the time to let your imagination run wild. Many people get a thrill from horror movies and haunted houses -- so long as they're actually safe -- but genuine terror is something most people want to avoid. When fear doesn't subside after a threat is gone, or becomes a phobia, it can be a real-life nightmare. When does healthy fear run amok and become pathological? Why do people respond to threats differently? And is there really a way to "conquer" fear?
Join neuroscientist Joseph LeDoux of New York University on Thursday, 31 October, at 3 p.m. EDT on this page for a live chat when we address these questions and take yours. Be sure to leave your queries for our guests in the comment box below.