Learning and Serialization

I saw a phenomenon with Aidan that I also see in myself, particularly in dog agility.  I recently picked up a nice John Deere play tractor at the Conway Mall, also know as the dump.  I ordered and installed a new battery and it works great.  When he was first learning to drive it, I noticed that he had difficulty steering and operating the gas peddle at same time. 

I notice this in agility too when I learn a new task or when I am really focused in one part of my handling.  It seems to take a comfort level before you can do many things at once and/or rapidly switch your attention to the many aspects of dog agility that must take place simultaneously.