These findings challenge the current belief that the brains of autistic children have fewer neural connections than the brains of typically developing children. The findings could lead to new ways to detect autism early and new treatment methods, said the authors of the studies, which were published in the Nov. 7 issue of the journal Cell Reports.
"Our study addresses one of the hottest open questions in autism research," Kaustubh Supekar, of the Stanford University School of Medicine, said in a journal news release.
Using a large database of pediatric brain imaging, Supekar and colleague Vinod Menon found that the brains of children with autism are "hyper-connected," and that those with the highest number of connections have the most severe social impairments.
In the second study, Ralph-Axel Muller and colleagues at San Diego State University discovered hyper-connectivity in the brains of teens with autism, particularly in the regions that control vision. They also found that the severity of autism symptoms was associated with the number of neural connections.
"Our findings support the special status of the visual system in children with heavier symptom load," Muller said in the news release.