Ok, so stories like this SEEM far-fetched but you can look to science and realize that some of this stuff isn't nearly as crazy as you may think.
Toxoplasma gondii, a parasite found in rats and cats has the effect of modifying the rat's (intermediate host) behaviour in such a way that the infected rat will seek out the scent of cat feces as opposed to shy away from it. Big deal, right? Well .. where you find cat crap you will find cats - which are the intended determinate (final) host of the parasite. The parasite can actually CHANGE the rat's behaviour - a cognitive process.
Just think of the wonderful diversity of nature and then re-think the notion of a 'zombie' is
