You've provided us with a touching,enjoyable read here @riverflows! I always prefer to read about conditions such as this when they are in relation to the person. And that’s just what you did :)The first time I ever came across the term SPD was last year. I had never heard about it before. And, it was precisely through reading about new research on ADHD.

Quite heart-breaking to read how the little ones with SPD find difficult to filter relevant information from overall background stimuli. This is why, to begin with, I struggled with the notion that it had been favored by evolution. But, following the lines hilighted in your post, it turns out It is linked to brain regions that process action planning and responsiveness. Evolution must have loved it! :D

Best,
Abigail :)