4 4 Moderator: Irene R. Heim, Professor and Head, Department of Linguistics and Philosophy, MIT * Susan Carey, Henry A. Morss, Jr. and Elizabeth W. Morss Professor of Psychology; Chair, Department of Psychology, Harvard University * Gennaro Chierchia, Haas Foundations Professor of Linguistics and Chair, Department of Linguistics, Harvard University * Steven Pinker, Harvard College Professor