There are ways in which you can make that distinction objective to a certain degree. For example, by looking at responses that could be generated in the brain to exactly the same stimulus and there could be differences there.
Antonio DamasioYou can be highly concentrated on a person, on a problem, and be so good at excluding all other material that that becomes not just the focus of your experience, but practically the sole content of your experience, everything else falling by the wayside.
Antonio DamasioScott Fitzgerald said famously that "he who invented consciousness would have a lot to be blamed for." But he also forgot that without consciousness, he would have no access to true happiness or even the possibility of transcendence.
Antonio Damasio