[luk32]

So are trichromatic people colorblind to tetrachromats?

BTW. Wikipedia says that trichromatism was normal for mammals in the past, and then they lost one or two cones, which would suggest a different development path. The article does not touch on this.

Or did distinct cones were reduced, and then one of them split into two again? It's also interesting whether chemical structure of cones is similar. I guess I gotta do some research on my own.