It's much simpler IMO to explain autism as what happens when the brain systematically overreacts to surprising inputs at every level. The reason e.g. stiff face

It's much simpler IMO to explain autism as what happens when the brain systematically overreacts to surprising inputs at every level. The reason e.g. stiff faces and list-making would go together is that they're both coping mechanisms to reduce the probability of being surprised by anything. This would also explain social difficulty, the desire for rote social rules, the focus on special interests (e.g. fields of knowledge that can be mastered and therefore predicted), and when combined with the predictive processing theory of motor control, could also explain difficulties in motor control as being a predictive processing failure.