Since behaviour and experience are rooted in the workings of the brain, damage to the brain through physical trauma or disease often has consequences which are best understood in psychological terms. Clinical neuropsychology, broadly defined, is the application of psychological knowledge and principles in the diagnosis, description and management of such neurological disorder. It is a branch of clinical psychology and, as such, draws on the same body of psychological knowledge as its parent profession. T o some extent though, it also looks beyond this into the territories of neurology (the branch of clinical medicine concerned with diseases of the nervous system) and the neurosciences, and in this sense it is a discipline whose boundaries are not easily defined.