The brain begins to re-route signals and gain more control over the body. Limbs become more pliable and the body's natural healing processes take over, as best they can. STAGE 4 (Evolution): After rigor mortis goes away, and sometimes before, the zombie "evolves", for lack of a better word. How long this takes, seems to vary from person to person. Eventually, rigor mortis will go away naturally. This accounts for the stiff legged, stiff armed zombies we see. The process can start before re-animation, depending on how long Stage 2 takes to manifest itself. How else can we explain zombies hanging around, rotting, for years? Rigor mortis will eventually set in. STAGE 3 (Rigor): For whatever reason decay is slowed down to a snails pace. They can attack quickly from short distance, usually from behind it seems, but can't chase prey down if they run away. The body is clumsy and slow to respond this accounts for the Romero-esque view of the newly undead shambling zombie. Base instinctual functions, such as locomotion, hunger, etc.are all that remain.
Reasoning, communication, and all the other skills that separate us from the animals are gone. Higher functions are gone due to brain death. The reanimation agent, usually described as a virus, reanimates the brain first. STAGE 2 (Re-Animation): The dead body is re-animated, usually within hours, if not minutes. Even if resuscitated, higher brain function can be irreparably damaged. The brain is the last to go, as it slowly dies from lack of oxygen. Eventually, the person dies brain functions cease and the body starts to decay immediately.
They are still alive, but usually just barely. Through whatever means a person "catches" whatever it is that will eventually re-animate them. STAGE 1 (Infection and 1st Death): A person is infected.
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