I think that it has been established in TWD, that the Walkers react to sound and movement. One walker hears a sound or sees a movement and heads in that direction, others key off that one and join in and that's how a herd grows. I guess there could be a situation where there is no distinct external stimulus and you could end with a herd just milling around. Think of the scene at the feed lots, that stopped the crew trying to get to DC. In the book, World War Z, they describe a scene where a zombie spends days trying to dig out a critter out of a hole, in the middle of the desert, then finally gives up and wanders off. So assuming that the lore carries over, you might assume that they have some kind of limited short term memory, that keeps them on task, until that memory is over written or just fades away.
Buick,
You are spot on.
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