Thomas Metzinger

differences between dreaming and waking consciousness as well. In this chapter, we will argue that these differences mainly concern the subjective quality of the dreaming experience. The interesting question, from a philosophical point of view, is not so much whether or not dreams are conscious experiences at all. Rather, one must ask in what sense dreams can be considered as conscious experiences, and what happens to the experiential subject during the dream state. Finally, in order to arrive at a more differentiated understanding of dream consciousness, we will contrast our analysis of ordinary dreams with lucid dreams, as well as with the varying degrees of lucidity and cognitive clarity seen in semi-lucid and prelucid dreams

Let me begin by focusing on the long list of agreements between the Dan Zahavi and me. As he is such a careful and scholarly author, there are almost no misunderstandings to get out of the way first. At the beginning of section 2, there is a conflation of different concepts of possibility. If we grant that imaginability is conceivability, if we pass over “practical” possibility as a non-defined term, and grant that by “physically” possible Zahavi very likely means “nomologically” possible, it still would present a major step to say that something is conceptually or metaphysically possible. Not everything that is logically or conceptually possible is metaphysically possible as well—metaphysically possible worlds have to be interpreted as a subset of logically possible worlds. How this can be done is a subject of intense and highly technical debates in current philosophy of mind. We cannot possibly enter this debate here, but let me just point out how, for instance, Zahavi’s remarks in the second paragraph of page 4 rest on a conflation between nomological and logical possibility.

Of all the current philosophical attempts to rescue the concept of “self” by working out a weaker version, one that does not imply an ontological substance or an individual in the metaphysical sense, Marcello Ghin’s is clearly my favorite. His reconstruction of the original theory is absolutely accurate and without any major misunderstandings. Enriching the concept of a “SMT-system” with the notions of “autocatalysis” and “self- sustainment,” and adding the intriguing idea that we are systems reflecting these processes on a new level of complexity, namely with the help of an integrated PSM on the level of conscious experience, seems the way to go if one wants to keep the concept of “self.” I have great difficulties in writing a reply to Ghin’s commentary, simply because I agree with so much in it. Let us see where his approach leads us