Interesting New Study

Liu, King,& Bearman have published a fascinating new epidemiological paper.

Here is the abstract:

“Despite a plethora of studies, we do not know why autism incidence has increased rapidly over the past two decades. Using California data, this study shows that children living very close to a child previously diagnosed with autism are more likely to be diagnosed with autism. An underlying social influence mechanism involving information diffusion drives this result, contributing to 16% of the increase in prevalence over 2000-2005. We eliminate competing explanations (i.e., residential sorting, environmental toxicants, and viral transmission) through seven tests and show that information diffusion simultaneously contributed to the increased prevalence, spatial clustering, and decreasing age of diagnosis.”

I cannot offer firm opinion based on the abstract alone, but I would be somewhat skeptical as to how well they could account for residential sorting, environmental toxicants, and viral transmission. However, I will reserve criticism until I can read the study in full.

On the other hand, what a completely fascinating study! This is an interesting insight that might actually lead to some good follow up research. Time will tell.