I have a problem with this study. What about "possibility thinking?" What about those creative people who invent things and start businesses? Is Bill Gates white or gray? Wildy creative Richard Branson who started Virgin Airlines among other companies?
I wonder where successful writers of fiction fall on the white/gray scale. Are they different from nonfiction writers? Would they be considered "abnormal" by unimaginative psychiatrists? What color is a psychiatrist's brain?
I'm asking the same questions. Having a vivid and creative imagination requires the same type of brain activity. Character dictates how we use that energy, and I don't think any "scientific study" can measure that.
Have no fear. I'm sure your questions will be answered when brain scans are standard procedure for all school entrance physicals. Of course, it would only be for the purpose of assuring that they are properly categorized and diagnosed are placed in the proper educational setting for their capabilities.