"The results revealed that the participants with ASD and the participants with typical development could be distinguished with up to 90% accuracy based on differences in the volumes of gray matter in specific regions of the brain. The most significant brain regions identified in this study included the posterior cingulate cortex, medial prefrontal cortex, and bilateral medial temporal lobes. These areas of the brain make up the default mode network, which is responsible for internal processes like self-reflection. Moreover, a relationship was identified between ASD severity and the volume of gray matter in posterior cingulate cortex, again a region of the default mode network."
The youngest participant was 8, which is really very far from an acceptable age when we would like to have a flag. But we have to start research somewhere!