The contribution of many scientific disciplines allows us to know surprising aspects of the relationship between the brain and its functions. Current technology and the convergence of these disciplines are essential to understand the complex brain mechanisms underlying behavior. In this paper will be described some scientific disciplines whose studies help to understand the biological substrates of normal and altered behavior. We will describe some pathologies or neuropsychological disorders

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... , in addition, we will review some of the known neurobiological mechanisms that control our brain functions. This allows us to conclude that the behavior and brain functions depend on complex biological mechanisms, many of which are still to be elucidated.