2020, such an imaginitive year.

“I’ve found that the what we call a ‘zombie’ is merely a mental retard: the ‘cancer-cure’ infected the brain to the point that all real human behavior –personality, love, feelings, emotions, advanced cognition– recedes to an ‘attic corner’ of the mind, leaving only animal instinct and pure reflex to govern the body.”
The state of ‘zombie’ implies that the infected person is within a group of mental disorders, as common as OCD or anxiety disorders. This group of disorders is characterized by psychological or behavioral abnormalities associated with transient or permanent impairments in brain function. The disorders have different symptoms, depending on which area of the brain is affected and the progression of the disorder. I.E. if the occipital region of the brain is affected, sight is impaired; for the cerebellum motor activity is impaired.”
Now organic damage to the brain can result from a disease or drug that directly damages the brain (in this case the rabies drug), or from a disease that indirectly damages the brain through effects on other bodily systems. So we’re basically looking at a mental disorder that has nothing to do with souls, cellular change or anything of the like.”
I do find the green skin hard to explain away, though, but I have a theory: the brain corrupts so far as to obstruct skin-bound blood. The result is dead and gangrenous epidermis, but no pain is felt on the infected’s part: hence the high pain threshold.”
You can see here on the screen that I’ve isolated an infected region of this zombie’s brain –I borrow the crude label for convenience. This part of the brain, Broca’s area, is related to speech; thus an impairment of said area would result in our subject’s total or partial loss over his words, whatever language that is.”
Watch what happens when I stimulate his brain with an extremely high-frequency electro-shock”
…
“You saw? Or heard, I hope? He spoke –for one moment– and barely an audible sound, yes, but that proves these are not just mindless killing machines. Let me explain: I can ‘push back’ the virus bodies impairing his speech-region brain cells. To do so requires an extremely high frequency, one on the level of the virus’s own, and results in the curing of his ‘zombie’ state.
This is all indeed a good start, but the entire brain is infected, and the subject must be stimulated for an extended period of time for a permanent effect. The amount of electricity needed (I estimate) would be around one to two gigawatts, equivalent to a powerful bolt of lightening…in short: a tremendous amount, and –as of now– unattainable.”