I came across this treatment just the other day but unfortunately I can’t remember where. When I went digging around, I found a couple of articles including this one at Science Daily. The article is entitled “Autism: Sensory-Motor or Environmental Enrichment May be Promising Approach“. I also found a link to a website that goes into great detail about the treatment, Mendability.
If that isn’t enough for you , here’s a link to the study entitled “Environmental Enrichment as an Effective Treatment for Autism: A Randomized Controlled Trial” by Cynthia C. Wood and Michael Leon at the University of California-Irvine.