Comment by yetihehe

I think this is still important. How do you define a system? By boundary of communication, where inside system communication is fast, communication with outside is slow and limited. Think ( ( ((CPU) Memory) ((GPU) memory) PC ) Internet ). Your PC is a hierarchy of systems split on boundaries of communication speed. So, it would be proper that a brain identifies what's "inside" the brain in similar way.

So, ping>1 = that part is outside.