Before the advent of B&W, the only monochrome experience people were likely to have was the odd charcoal or pencil sketch - and they hardly have much impact, generally. And afterwards, TV and films were in colour. Actually, I can kind of prove it. The people who were in their formative years in that era, were people as young as my age, and upward. Luckily for me, there was a brief encounter with B&W TV in the early Sixties when I was still quite young, then I had no access to TV again until I was about 13 - 14. (Because we lived in rural Australia in the late 60's and early 70's when TV coverage was still mainly confined to cities. My parents didn't remove TV privileges, they removed us from the TV...)
And my dreams are in glorious colour. I'm sure had I been exposed to mono telly and films I would also be having drab dreams.
Which leads to a bit of an understanding of how environment affects and shapes us: Suppose you lived in a drab place with little colour other than the greys whites and blacks of permafrost - you're 25% likely to have monochrome dreams. Actually - since B&W TV would only have taken a few hours a day of your life while living in permafrost is - permanent - I'd say you would find that people in such environments are 50% or more likely to dream in monochrome.
These people were the drivers of technology and modern life. They had to be, because the land was inhospitable. And maybe it's easier to think logically in B&W. Whatever - I've just noticed and drawn your attention to what may well be an important correlation: People who lie in drab colourless environments invent things. And people who live in wonderfully friendly environments with a riot of colours (think jungles and tropics) were more content to adapt to life rather than adapt life to them.
Who knows if that's true, it certainly makes sense and explains the wide spread of stages of technological development of the different races. All it took was location...