I do not know but I relate autism with deep levels of awareness.
Sometimes, during some states of consciousness, one is able to receive a great flow of information in the form of insight and awareness.
Sometimes, during these moments, the flow of information is so much that one cannot talk or speak about it as it feels heavy and un-accurate.
Sometimes words cannot express some information from the Soul and all one can do is to remain silent and to perceive.
This is what I believe is happening with too many autistic people / children.