It seems that in George Romero’s “Dead” movie universe, the shambling hordes slowly get more intelligent as time progresses…
since it isn’t likely to be progression of time (as a newly-risen Zombie in “Land” is equally as intelligent as the one that bit him), what’s the likely cause, if it was time-based, the new shambler would only exhibit the “animal” intelligence in the original film…
for example;
NOTLD; Zombies have a simple “need to feed” motorized instinct, can be stopped by physical barriers/fire, no reasoning or higher intelligence, minimal (if any) tool use (the little girl in the basement kills Mom with a trowel)
Dawn; Zombies follow an instinctual urge to congregate in groups at the mall, “memories, what they used to do, this was an important place in their lives”
Day; first signs of base-level reasoning and associative behavior, the shamblers penned up waiting to be experimented on show signs of fear of their captors, Bub shows memories of his past life (ex-soldier), basic reasoning (listening to music, operating a gun) and simple emotions (recognizing “freind” from “food”, showing pride in figuring out how to escape from his chains, sadness at the death of his “father”, anger and revenge at the soldier who killed “daddy”)
Land; [spoiler] “Big Daddy” figures out how to operate a gas pump, use a firearm and jackhammer, and shows more advanced reasoning (realizing that since they don’t need to breathe, they can cross the river by walking underwater across the riverbed) and more advanced cause-and-effect reasoning (shooting a burning zombie so it doesn’t detonate a fuel pump, the elaborate planning of the death of Dennis Hopper’s character by filling the limo with gas, creating a puddle of fuel around the limo, then rolling a lit propane cylinder down the ramp to detonate the pooling fuel) he also teaches the other Zombies to use guns/tools
IIRC, he also seems to be the first Zombie that does not eat flesh for the entire length of the movie, he may have the ability to repress his instinctual need to feed[/spoiler]
so, over time, the Zombies are getting smarter, why is that, if it was a contagion (lets say it’s a virus), i could see the viral contagion evolving over the course of the films, seems logical, but that would limit the “smart” zombies to those that had died/risen by a bite, scratch or other fluidic contamination, simple deaths and suicide risen zombies would be the brainless “shamblers”
it wouldn’t explain “radiation/cosmic rays” as those, being purely physical contaminants, do not evolve
also, if we follow the events in Land to their logical conclusion, given enough time, the only difference between a Zombie and a human, aside from the decomposition factor, would be the Zombie’s preference for really, really rare meat… they would be able to control their base urges, perhaps even supress them…
what do you think, what’s the most probable reason for smarter Zombies (better education system, perhaps?, Undead Sesame Street… “B is for BRAAAIIINNNS!, that’s good enough for meeee”, "one, ONE human arm, ah, ah, ah, TWO, two human arms, ah, ah, ah…)