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 DamasioAlthough when you look at people that say, from the same culture, roughly the same age, and not very difference intelligence, and you make a lot of detailed questions about the experiences of say colors, situations, and so on, you'll get very similar answers.
Antonio DamasioI continue to be fascinated by the fact that feelings are not just the shady side of reason but that they help us to reach decisions as well.
Antonio DamasioI think it's reasonable to say that even thought, in all likelihood, we have slightly different experiences of reality, they are similar enough to us not to clash. In other words, I'm not, it's very unlikely, in fact, let's say impossible, for you to say the situation in which you and I are in right now, relative to the machinery that is capturing this.
Antonio Damasio