Derailing your thread...
When a person has a stroke and parts of the brain are deprived oxygen and die, the other parts have to pull double duty. For example: when blindfolded for an extended period of time the visual cortex will begin to process nonvisual information such as braile.
Also: Sorry that your mother had a stroke.
I saw news about these creatures a few days ago.
Our brains are about fifteen hundred cubic centimeters, Homo erectus brain was about twelve hundred. It's about cooling. The larger brains have more surface area to draw away heat, and therefore work better.
That they had such small brains and used fire and tools, in Indonesia yet... they're quite interesting.
Also: The 90% thing, that's just folklore.
It's an alien.
See: Wacky Alien Physiology
See Also: George Lucas makes **** up.
"According to Lucus, not all wounds cauterize immediately, it depends on the wound and who it's inflicted upon. Humans cauterize quickly due to their chemical makeup and the effect the laser has on them, but with alien species it's difficult to know how they would react."
Movie Mistakes
Ah, of course.
Because it's a tauntaun? Because Solo didn't cut the intestines? I couldn't say. I can say though that neither Luke or Anakin, nor the people on Jabba's barge, nor the Geonosians, nor Maul, nor Qui-Gon bled when cut.