[SZJX]

If it’s true, one idea to explain it might be oversensitivity to input (which maybe sometimes leads to withdrawal or avoidance to social situations which could be too stimulating and stressful?), which given the connection between autism and ADHD which has become discovered more and more by research in recent years doesn’t sound entirely unreasonable to me. Then again I have no expertise in this field whatsoever so can only conjecture.