Fluid Reasoning is a human trait, not an Autistic trait.
The relationship between Aspergers and FR does not necessarily go both ways. In other words, an Aspie may have a tendency to have high FR, but a kid with high FR does not necessarily have Asperger's.
As far as studies of Aspies, go. Parents with higher intelligence tend to get more services for their kids thus their kids get identified at a greater rate. There is a good argument that there is selection bias in many studies involving these kids.
