Some of the contributions here got me lost in the numbing technicalities of neuroscience. But I found the book well worth looking at because of the chapters by Alwyn Scott and Johnjoe McFadden, arguing that quantum effects involving the microtubules in neurons are not the explanation of consciousness, and those by Stuart Hameroff and Gordon Globus, arguing that they are. Hameroff's notorious theory, developed in collaboration with physicist Roger Penrose, is quite seductive in many ways, but what can he mean when he says that orchestrated objective quantum reduction (Orch OR, supposedly occurring in microtubules) non-computably accesses "Platonic values in fundamental space-time geometry" (p 235)? A glance at his quantumconsciousness.org website suggests that he is partly motivated by mysticism ("secular spirituality"); this is likely to make me more hostile to the Penrose/Hameroff theory than I ever was before. Globus's chapter, for its part, is one of the most astonishing -- and unsummarizable -- few pages I have ever seen; deciding whether it is hokum will require some follow-up reading. Also in the dumbfounding-to-flaky range are the last two chapters, which get into (quantum) cosmological considerations.