Brain is a neuronal jumble that interweaves through the synapses to make a very complex network. 
Brain is plastic. It changes with each experience, and knowledge, turning the connections. Neurotransmitters and other molecules distort our knowledge, our perception of the world, and our personality. 
Mente Subterránea (Underground Mind) is a small research about our consciousness, about the neuronal interconnections that at end of day make us what we are.