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If I would show someone a yellow object and ask them, "is this object yellow?"
That person would say "yes".

But I could never know if my perception of the color yellow is the same as that other person's.
Because he or she could actually be seeing, what I know to be the color green.
But then tells me that its the color yellow because that has been taught to him or her from young age.

So how can you test if people are really seeing the same color?

Question closed and can now be found @

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closed as off topic by Waffle's Crazy Peanut, David Z Jan 9 '13 at 16:51

Questions on Physics Stack Exchange are expected to relate to physics within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

Michiel you may find this Answer to a recent Question useful. – Eugene Seidel Jan 9 '13 at 15:35
Seems like this is more a question of perception rather than physics... it may be more appropriate on – Kitchi Jan 9 '13 at 15:35
Let us hope the answer contains alot of physics then :D – user17615 Jan 9 '13 at 15:48
@DJBunk, Designing such test needs good opinion from physics. – AmirHosein SadeghiManesh Jan 9 '13 at 16:18
Really outside of the scope of this website but Wikipedia has an article about how speakers of different languages will differ in how they identify colors. Perhaps this, plus the Answer that I linked in my earlier comment above which talked about qualia, will be helpful. – Eugene Seidel Jan 9 '13 at 16:43

Inadvertently I found how to test color perception by another person and discovered the color blindness of a workman.

A gypsy came by selling plastic chairs of all colors. We bought some for the summer house, and a workman who was present bought two bright orange ones. I was surprised by his choice and before he left for the day I thought he might be color blind, and asked him:

" what color are the chairs you bought."

"why, a nice blue" he replied.

So a test is easy. A questionnaire with colors.

and it has nothing to do with physics.

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I dont understand how this anwsers my question, in your situation, you and another man see the same color but discribe it different. In my situation I and another person see a different color but discribe it as the same. – user17615 Jan 9 '13 at 16:02
@anna v, You didn't get the question correctly. He is not asking how we can know somebody cann't recognize colors from each other. – AmirHosein SadeghiManesh Jan 9 '13 at 16:15
@anna v, im afraid you still dont understand the question, when all of us where little children we learned what color has wich name because our teacher or someone has told us what name that specific color has. But if you already perceived the color yellow different then I did at the moment we where taught, then we can still both agree that a banana is yellow, yet we both see different colors. – user17615 Jan 9 '13 at 17:56
then the question makes no sense. There is no way the situation can be tested except metaphysically. – anna v Jan 9 '13 at 20:14
well I dont know the answer to this question thats why I'm asking, and was hoping this was testable in some way – user17615 Jan 9 '13 at 20:38