> If Robert is 700 part Ultimate Brain and 1 part Robert; and
> Ray is 700 parts SuperiorBrain and 1 part Ray
> if the human portions of the post-Singularity cyborg beings
> are minimal and relatively un-utilized
> will these creatures really be human?
> In what sense will they really be Robert and Ray?
IMO, as long as there are enough cycles to run the 'ego subroutines' from the original bioform then the same sense of self will be maintained.
It's when these original 'ego subroutines' (which will be a line item in process accounting) are altered will be see a fundamental changing of the human that was.
There will be add-ons to the 'ego subroutines' just like there are add-ons to firefox.
You will cure your fear of spiders or have access to pleasure centers with a simple mod.