Could people in the future upload their conscious minds to a computer and, so to speak, live forever? Do we have an obligation not to delete a conscious computer's software? How we answer these questions would seem to depend on how we answer more basic questions. Can a machine have thoughts? Can a rock have thoughts? Would a machine with thoughts have consciousness? Even these simpler questions are dicult and controversial. In this course, we will each examine our own ideas about the mind and consciousness, and compare our ideas with those of other philosophers. We will consider di erent ways in which minds, consciousness, and the physical world might be related to each other. We will do this by thinking both about our own minds and experiences, and about how representations of the world might (or might not) exist within brains or computers.