The "Problem" of Qualia

[updated 13 June 2020 to add Davies quote]
[updated 25 July 2022 to provide more detail on "Blind Mary"]
[updated 5 August 2022 to provide reference to Nobel Prize for research into touch and heat; note that movie Ex Machina puts the "Blind Mary" experiment to film]
[updated 6 January 2024 to say more about philosophical zombies]

"Qualia" is the term given to our subjective sense impressions of the world. How I see the color green might not be how you see the color green, for example. From this follows flawed arguments which try to show how qualia are supposedly a problem for a "physicalist" explanation of the world.

The following diagram shows an idealized process by which different colors of light enter the eye and are converted into "qualia" -- the brain's internal representation of the information. Obviously the brain doesn't represent color as 10 bits of information. But the principle remains the same, even if the actual engineering is more complex.

Qualia
Figure 1

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