The human brain is consisted of numerous modules, and there have been attempts to identify their numbers and location such as the Brodmann areas. It is pretty obvious the brain has different modules since everything in nature differentiates when growing. Consider water droplets. When water is fed to a droplet it grows until the surface tension could endure, where it breaks to form another water drop. It is a natural phenomenon for big objects to divide into smaller portions and the same goes for the human brain.
With this phenomenon in mind, many questions arise: How do neurons in the brain differentiate into different modules? What is the threshold or ‘surface tension’ in terms of how a brain module diverges into separate modules? Are the modules in the brain discrete or somewhat continuous? How do different modules work together as a whole in a synchronized manner? Why are the modules located in this way and not in other possible locations?
These questions are yet to be answered, and still needs to be researched.
Jaesung Yoo 