What function does it serve? Assuming that my brain is just a computer run entirely by deterministic and/or probabilistic processes, why does there have to be a "passenger along for the ride"? When I talk about sentience, I am referring to your ability to experience experiences. Many would say that it allows us to think or make decisions, but our computers do this just fine and they are not aware of themselves. Isn't the human body and brain just a machine that responds to input that it receives through the senses? Why does there have to be an entity within that experiences this life?