The basic purpose of this book is to communicate a new understanding of human behaviour by taking into account how both cognition and emotion exist at a neurological level. Neurological evidence can now explain how cognition and emotion work interactively. This means that whenever the brain is mentally operating, both cognition and emotion are working. The final outcome of this internal activity is/may be an external behaviour. In this sense, speaking, reading, learning, eating, depression, anxiety, and so on are all behaviours produced by central neurological mechanisms we have been aware of since the 1990s. The neurological evidence is based on several methods of study, one example is the latest functional magnetic resonance in humans. This book presents an explanation of normal function to be followed by an explanation of dysfunctional behaviour.