Our brains are more powerful than we ever realised. Too often, we assume that people's natures are fixed, immutable. For sufferers of depression, anxiety, ADHD, addiction, or the after-effects of stroke, this can be a difficult thought. For those with extreme conditions, such as locked-in syndrome or psychopathy, it can feel as if there is no hope at all. However, in Your Brain Knows More Than You Think, leading neurobiologist Niels Birbaumer turns these assumptions on their head.