Tuesday, November 29, 2005

Can you see what I see?


This fascinating article calls into serious question an old first-year problem -- "How do you know that things look the same to other people?" How do we know, for example, that red looks (subjectively speaking) the same to other people?

Perhaps you and I percieve colour differently, and when I point to something with a "red" wavelength, and say the word "red", I'm actually experiencing the same thing as when you see yellow. Of course, due to a lifetime of conditioning and learning, we both have learnt to respond in exactly the same way -- but we still have different experiences.

These images of people's retinas suggests there may be more to this conundrum than first thought.



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