In the spectrum inversion scenario, Invert's experience has Q_G (green qualia) while Nonvert's experience has Q_R (red qualia) when both view the same red peppers.

Spectrum inversion scenarios help to focus the dispute between representationalists and their critics. (Actual cases of shifted spectra can also serve: see Block 1999.) Any version of representationalism is committed to the following thesis. Consider a case of red-green spectrum inversion, and imagine Invert and Nonvert are both looking at the red peppers depicted in figure 6, against a neutral background. Nonvert’s experience has \(Q_{R}\), while Invert’s experience has \(Q_{G}\). Because the t