I doubt that the subjective experience of the world is as immaterial as some want to believe. Our subjective experience of the outside world can be quantified

I doubt that the subjective experience of the world is as immaterial as some want to believe. Our subjective experience of the outside world can be quantified in terms of our ability to make predictions about the world and use them. All of us make and use predictions about the perceived reality as part of our conscious experience. However, if you have accurate enough representation of the outside world in your mind, it puts physical limits on the minimum amount of entropy your brain can have. And entropy is a completely physical quantity. There is an article [1] I found to be interesting that explains why entropy, as defined in Physics, of the same physical system can be different in eyes of different observers with different prior knowledge/reasoning abilities/etc. In a nutshell, it makes perfect physical sense because if one would take into account that all these observers can't exist without physical medium and that their mediums should also be considered to be parts of the physical system of interest. But then it becomes clear that accuracy of the subjective representation or experiences of the outside world has a direct effect on the entropy of the underlying physical medium because this is what the second law of thermodynamics, applied to the whole system of an observer and the system it interacts with, says. [1] http://lesswrong.com/lw/o5/the_second_law_of_thermodynamics_and_engines_of/ http://lesswrong.com/lw/o5/the_second_law_of_thermodynamics_...