I'm wondering if the hyper focus seen in autism spectrum disorders and the hyper focus seen in ADHD are different? I've been diagnosed with autism and definitely have special areas of interest that tend to be narrow in focus, but they rotate. I'll be super into one, and then it changes to something else.

My friend also has autism and says her special interests rotate but in a much slower fashion. Is a faster rotation of special interests indicative of ADHD? Or is it a combination of ADHD and autism? (I've not been diagnosed with ADHD but it has been suggested).