http://www.physorg.com/news69603874.html

Why is the perception of the physical reality changed as opposed to simply the perception of difficulty of that physical reality?

Perhaps the perception of the difficulty of the physical reality changes the perception of the physical reality itself. The human brain is a strange thing...

Curiously enough, you reminded me of Heisenberg's uncertainty principal that states that no instrument can measure both speed and position because to use an instrument would interfere with the system. Perhaps to think and to try to make sense of reality is also affected by the environment and that you can not measure a fact with absolute certainty unless you have a universal environmental condition in which you can say absolutely without a doubt, that things are as they should be. But then we are all left with the philosophy that questions whether truth is Relative or Absolute, and to curtail a long discussion there is no answer that in any possible way, out-weights its anti-thesis. These kind of discussions are very interesting and I for one, enjoy them but like most of the kind, they often leave u with a headache and no answer at all, perhaps only the proof that there can never be one single unviserally known answer.