Just deer morphing into there post rut, high pressure,winter cover, survival stage. If you scout your hunting haunts year round, year after year, these patterns will reveal themselves to you.
A interesting observation for comparison; For years I scouted my deer woods that consisted of a four square mile area. Within these confines there were very prominent deer runs (That I term the ancients) that rarely had a track one in them! How can this be I thought? After monitering them for several seasons there significance was revealed. These trails were being used heavily during the pre rut and rut phase only. After firmly grasping the big picture concept, I could tell these trails were corresponding to the varying wind directions and the bucks using them for cross wind scent checking, shortest and most advantagous routes between doe bedding areas and quickest route crossing opposite running runways ( I believe for scent checking purposes again)
These variations in the overall changes that the deer make throughout a season is where the term patterning truely comes from.