Bottom line is simple...if one perceives there to be a difference, then there is a difference. It shouldn't matter if others don't perceive it and others shouldn't demand or expect that he prove it. Everyone is free to follow their own path and there is no right or wrong.
Let me restate that from my perspective: Bottom line is simple...if you perceive there to be a difference, then there is a difference for you. Everyone is free to follow his own path. Just don't tell me that I am wrong if I do not hear it or if I can demonstrate that it does not exist.
Kal (not a psychologist but familiar with the human brain)