Well this WU primarily exists because I have a question, and I would like someone around in Biology or Medicine to answer it.
It is an empirical fact that the human eye is sensitive to different wavelengths in the electromagnetic spectrum, and this is the origin of colours. Other physiological effects of colour are also empirically verified. For example, when we mix Red, Green and Blue light we see White light, and this is something that is true for everyone.
However, what about the actual sensation of colour. Has anyone devised an experiment which would be able to determine whether the actual senstion is the same for different people or not?
For, after all, what you see as yellow I could see as red, and what you see as red I could see as yellow. We would of course never know for we would agree on names and other physiological effects like what happens when we mix colours(Hope I'm making myself clear). But it might be possible(probably by means such as giving direct signals to the brain) to actually determine the sensation of colour. Has anything of this sort been done?