So I've seen multiple zombie fiction works explaining zombies by saying that the zombie pathogen destroys most human brain functions but leaves behind the cerebellum and the brain stem, so the zombies are driven by instinct alone. I would like to use this for my zombie story too because it makes killing them harder! Or at least before everyone figures out that you need to hit a specific spot to put down the undead.
But the senses (smell, sight, hearing) are controlled by the cerebrum if I recall correctly, and without its senses the zombie won't be able to find people to eat! aww.
Also I've read about this thing they had before where they would destroy the frontal lobes connection with the rest of the brain in mentally ill patients in an effort to cure their insanity and such. It was a really bad idea and some people ended up paralyzed. The motor cortex or whatever is in the frontal lobe too and its name suggests that it controls movement, so without the cerebrum I don't even know how the zombies would even move at all!
But I have seen articles that claim frogs with only the brain stem left can still react to the environment, swimming in water and following light sources, and chickens with heads chopped off can still run around aimlessly before they drop dead, but I'm pretty sure the human brain has a different structure and therefore will work differently. (I can't provide the sources for these because I forgot where I found them)
I'm thinking about jellyfish because they can still catch prey and stuff even though they live on reflexes alone. Not sure if something like that would work on zombies though.
Anyways the goal is to provide a scientific explanation for how zombies can
- Follow light sources, loud noises, and humans nearby via shambling
- Try to grab and chomp on humans if they are within the zombies reach
with their cerebrum destroyed, leaving behind only the brain stem and the cerebellum.
Thanks for your time! Sorry for the wall of text.