> if Language A does not distinguish green and blue, it does not necessarily mean that the speakers of Language A cannot distinguish them, but only that Language A does not distinguish them linguistically.

True, but just to be clear: In the first link in the article it's shown how people speaking languages with no blue/green distinction are significantly slower at selecting the 'odd one out' when given a set of blue shapes and one green shape. Furthermore, this effect is only significant in their right visual field, whose images are processed by the left (more language adept) part of the brain.