This published peer-reviewed study shows that VCA is a proven technique that actually works to teach communication, academics and reduce behaviors in autistic children. The study also officially means that VCA is research-based and evidence-based in its own right.

The results of the study indicated that individuals utilizing VCA showed statistically significant improvements in communication as well as a decrease in maladaptive behaviors.

Another major outcome is the questioning of the validity of the original diagnosis of intellectual disability given to the nonverbal children with ASD. 

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https://www.tandfonline.com/doi/full/10.1080/23311908.2020.1803581