There was another conclusion suggested for the reason those subjects from Melbourne had more 'grey matter' than those from Sydney, which was that the brains of Sydneysiders had eliminated unnecessary neural pathways, connections and links, so making their brains more efficient. There was also the possibility considered that another reason for the differences, is that Sydney brains were too mature to spend too much time thinking about sport. They didn't need as large an amount of gray matter to remember football scores.