DS5 has fairly severe SPD's. In his case, he is unable to process the input of his surroundings. Every second of every day, your body is accepting input ie: sights, sounds, smells, temperature. The brain is supposed to process everything, even those things that you are not aware of. For my son, this doesn't happen. The information goes in, piles up and overwhelms him, causing him to shut down.
DS8 has OE's to sound primarily. He is forever turning down the TV and covering his ears as the toilet flushes. But there isn't anything that signifigantly affects his day to day function.
While some may say that DS5 has the same thing as DS8 only in a more severe form, I find the two very different.
