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One way we can get evidence qualia are the same or very similar for different people is by reactions to it, beyond just the word. For example, beyond the word "pain", we have other strong reactions to pain. So nobody suspects other people might experience pain as pleasure and vice versa. Obviously not! There are no obvious signs for colour qualia, so it ...

I have often wondered this myself and have never found a way this could be asserted. In fact we know that not all people perceive color the same way: up to 5% of humans are colorblind and about 2-3% of the women are tetrachromates, they have an extra cone type in their eyes (usually somewhere near the red spectrum). So it would be logical to assume that ...