My undergrad is in Neurobiology, but I don't work in the field, but I can give you my understanding.

This article is basically an article that reviews the current theories regarding the neuroscience of intelligence. It's saying that there seems to be evidence of 'g' (which you could call IQ, but is the variance in cognitive abilities) that dictates the efficiency of our brain as a network of networks. It describes the brain as a interconnected global network of local networks that have discrete responsibilities. The reason these local networks to handle specific things is because it's more efficient to process in close proximity. And that the communication between these 'nodes' and the ability to tap into stored memory and intuition is described by 'g'.