In this episode of “What Is X?” Justin E.H. Smith comes ready to be persuaded, as he tries to get a handle on one of the most difficult Xes of all: consciousness. What are the inner states we experience? Is figuring it out just a matter of neural activity, or might there be something to consciousness that science can’t fully apprehend? What is the nature of introspection, the stream of thoughts and experiences we have in the privacy of our own intellects? What are the boundaries of consciousness? Is it different from sense perception? What does it mean to “see” a red dot? From the origins of psychoanalysis to philosophy debates of the 1990s, Justin and Eric try to answer the question so poignantly captured by The Pixies: Where is my mind?