If one is a physicalist, then presumably one thinks that consciousness emerged as a result of naturalistic evolution. From this, it would seem to follow that consciousness was selected for, i.e. that it provided some kind of adaptive advantage, which lead to conscious organisms out-competing non-conscious ones. (If consciousness is a purely physical process, then it would likely depend on rather complex biological systems, and so it is unlikely to be a spandrel that simply piggy-backed on som...
