Zombies when not interacting with humans.

We all know zombies, mindlessly shambling towards us, running after us or dragging their gutted selves towards us. But what do zombies do when they are alone or amongst themselves. Do they absently try to relive or re-enact things from memory. Basics of holding hands, or attempts at what they did in their job. 

Do they reenact these to find out who they were in life, or mindlessly shamble into objects and are merely attracted by sound, not smell. So far, sound has always been effective and drawing zombies. Maybe loud thumper machines, designed to make noise will draw meandering zombies to these buildings. Though un-occupied they could be powered by wind, or solar. 

Numerous questions arise. No one has sent or tried to send unmanned remote controlled cars, or small vehicles into zombie infested territories to study the infected at a safe distance to which zombies will neither be attracted to, or towards an inedible object of a plastic remove control car. Sure the range to control and see through the camera would need to be boosted. But then again this could have further insight as to whether zombies are changing as with the virus for the past 3 years from 2007 or more. 

Are zombies becoming less mobile or more mobile, is the virus mutating and are there those who are carriers but not able to reanimate, however contact with saliva, sweat and such can cause infection and reanimation of the victim exposed?