Anyway one complication between species is we know that brains are composed and are laid out differently which affects density and distribution. Cephalopods for

Anyway one complication between species is we know that brains are composed and are laid out differently which affects density and distribution. Cephalopods for instance lack mylenation and appear to have their brain functions a bit more distributes to the point that they occasionally have "rogue arms" which act dysfunctional to the point the host decides to just chew it off and eventually regenerate a "sane" replacement.