Not the person who responded, but a lot of times, these neurological "impairements" overlap. Why? Perhaps genetic mutations? Developmental Delays? We did genetic testing on my son due to multiple global delays. He has a frameshift mutation, that he got from... yours truly. I'm a lot like you sans no internal monolgue. Which btw I am very intrigued how adhd and no monolgue go together. I sometimes have 2 going at once haha. Also, you mention you're asking about it. What exactly are you asking?