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I found an article that got me thinking about the brain as a system (http://jn.physiology.org/cgi/content/full/96/5/2797). Scientists were performing tests on monkeys and humans and their abilities to be trained in operating and using complex tools and devices. For example, humans can drive a car or use a computer mouse, and monkeys can be trained to use a rake to gather snacks. The scientists noted the significance of the input-output map and the ability to respond and adjust to “stimuli” from the outside world. Thus again, I think this shows that the brain has this capability because it IS a system and can respond to a different input from one that it might be expecting using a differing output.