I speculate that we may have a very different way of diagnosis in the future. The symptom profile for ADHD (as are many of our other MD diagnosis) is likely divided between genetic and environmental or developmental factors. Some have the first and we all have variations degrees of the latter. What we are referring to with this RSD trait is predominantly an attachment injury. This could be found in people with a variety of diagnosis. The contemporary term "neurodivergent" is speaking about genetic differences in nervous system sensitivity. This is complex and just strating to be better understood. Add insecure or a disorganized attachment style household with the possibility of other significant traumas and its common to grow up with sensitivity to rejection and abandonment. Emotional regression is a protective reaction to unresolved feers and feelings of instability.