
Re: "see which groups of neurons are activated"
Good point, the neurons are always active but depending on the weights on the links may or may not contribute much to the decision output, so you do need a tool to light up which nodes are active in the context of the overall network activity.
This is interesting but I'm not sure how much benefit to the world this is, how the network ends up being structured often relates to the initial random weighting assigned to the links.