"Poldrack’s team found more connectivity in certain networks of the brain -- particularly between systems associated with movement and vision -- if he didn’t have breakfast and coffee. Poldrack says that’s surprising: “If anything we would have predicted that if you’re tired and caffeinated, connectivity would have gone down.” Figuring out why this effect occurred might be a fruitful avenue for research."

It is very intriguing and interesting that neural connectivity in systems of movement and vision is increased when one is fasting. My speculation is that those neural activities are handed down from our early ancestors. Perhaps when we were hungry, our brain is actively scanning our surrounding areas for ways of obtaining sustenance.