Other Minds, by John Wisdom, Chapter 2: Basil Blackwell (pub), 1965
[This is a brief summary]
This chapter (which was also a paper in Mind Vol 50 No 197), is a continuation of the previous chapter which introduced the skepticism about other minds. In this chapter, author writes a dialogue between the skeptic "Black", who asserts the unknowability of another's mind/conscious-states, and the person who apparently wrote the first chapter, "White", who represents the view that such a question is a joke, or absurd.
In this chapter, Black ultimately gets to make the point that when Smith finds out he will go colorblind tomorrow, it means more to Smith than it will to the rest of us. Not only does it mean that Smith will fail the relevant discriminatory tests and so on (what it means to us), but Smith will also not be able to see e.g. red the same way: it will look grey to him. "'No more of this, only this' and he looks at a colorless engraving" (pg51). This is the crux of the difference that Black tries to get White to admit. The difference between understanding this (or any) description about mental states and other descriptions about invisible things (like leprechauns in watches or electric currents in copper wires) is that of different meaning on the subjective level, a meaning we readily understand since we know that we ourselves have qualia. [Yet don't we grant that Smith also has qualia if the statement that he'll be colorblind means anything extra to him too?]
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