The brain is probably the most complex structure in the known universe, complex enough to coordinate movements, gather and organize lots of sensorial data, perform abstract reasoning and develop new ideas. Understanding the mechanisms underlying brain function is therefore one of the biggest challenges of contemporary science. A deeper comprehension of the brain is not only a central issue for pure science but would have an enormous impact for the whole society. In fact, the knowledge of brain complex machinery will allow finding new therapies for diseases like Alzheimer or