Yes, and in (american) English there is no distinction between light blue (голубой) and blue (синий), and the rainbow has 6 colors. I am sure that the same experiment will work as a comparison between Russian speakers and American english speakers. In fact, I noticed that when I am thinking in English, I distinguish these two colors less than in Russian.

Language determines the way we think. Most people's first concious childhood memories coincide with the time they learned to talk. If we have no way of describing something, in a way it doesn't exist.