A few years ago we ran a short poll on the various different types of autism. You can still take part here if you wish.

Anyhow one of the commenters told us we should also have mentioned Pathological Demand Avoidance Syndrome or PDA.

Now I confess to being a bit tardy in putting something up but found this excellent video from Michelle Hatcher who is herself a mother of a son with both Autism and PDA.